Mostly Original - 1969 Dodge Charger R/T
Real '69 Charger R/T? Check. The owner? He's original too.
09/23/2018
Original owner stories are rare. Why? There is no rational reason to keep a car that long. They wear out. They get old. They feel old. Technology moves on, compromises become milder, driving comfort and convenience increase with each subsequent generation. Devotion and a rabid enthusiasm generally go hand-in-hand when it comes to old cars. Rarer still is the first and only owner of a serious muscle car, a nearly 40-year-old, well-maintained machine; so many were beaten up and broken back in the day that you just don't see them anymore.
What would you say about an original-owner car that isn't owned by a hardcore speed freak, but by a guy who just happens to really like his car? His garage isn't stuffed to the gills with memorabilia; the trophy room hasn't displaced any of his kids' bedrooms. He's just a guy who bought a bitchin' car to use as transportation in the great commuter wars on Southern California freeways, and who has held onto it all these years simply because there was no good and justifiable reason to unload it.
For Luis Gonzalez of West Covina, California, the decision process behind choosing a Charger R/T can be summed up in one word: Bullitt. "I saw the Charger in that movie and I thought, 'man, that's the car for me.' I saw the film in the summer of '68, and by the time I went looking for a car, the '69s were already out. There weren't a lot of leftovers, though, and the dealer told me I could have a new '69 for almost the same money as a '68. So I ordered one."
Gonzalez had enough of a taste for power and speed that he checked off the R/T package, which came with the 375hp 440 as the base engine. (Lots of people agreed with Gonzalez that the R/T was a pretty good deal: Of the more than 61,000 Chargers sold in 1969, fully 21 percent were the hot R/T model.) Selecting the cleverly named Dark Green paint and a vinyl top? Not tough choices: Both were high fashion when he was ticking away at the order blanks. And he ticked enough boxes to turn a $3,575 Charger R/T into a $4,837 Charger R/T, according to the Monroney sticker.
But then he made a couple of unexpected moves. Specifically, it's what's missing that's a little surprising. R/T tailstripes? You could surmise that they simply weren't reapplied after a recent repaint, but in truth the stripes were deleted at the factory. "I didn't like 'em," Gonzalez says simply. Fair enough.
And take a peek inside: The expected bucket seats and console that are part and parcel of an R/T Charger are MIA. Instead, there's a dark green bench seat and a chrome-levered column shifter. Gonzalez's R/T was going to be an automatic no matter what, but the bench seat? "I was still dating in those days," he recalled, with a warm smile in his voice. "I wanted to let my girlfriend get close." His girlfriend at the time became his wife a year and a half later, if that's any indication.
Muscle cars were often fated to do some hard time at the track, where young men went to test both mettle and metal against the clocks and against the guy in the other lane. But Gonzalez was never really interested in the scene. "I took it down once, just to see what it was all about. I smoked the tires halfway down the track. When I came back to the pits, a friend lent me his slicks. It went a little better, but by the time I'd gone down the track, I thought, 'OK, that's enough.' "
Clean trunk features the original spare tire and protective taillamp boxes
The vinyl top isn't original, but it was redone in 1975 with original factory top material. Seems Gonzalez was doing some home improvement work, and since this was his family's only car at the time, he drove home with planks of wood strapped to the roof. One wrong move in the driveway and he tore through the factory-applied black vinyl--though, to his credit, he got it repaired the right way.
Owner Luis Gonzales
All the while, Gonzalez raised his ever-expanding family: three little girls grew up in the back of that Charger. But after suffering the indignities of two separate oil crises and the price of gas shooting up well north of a dollar a gallon, and noticing that there weren't many cars like his on the roads anymore, Gonzalez put his Charger aside in the early '80s, still largely unblemished beyond parking lot dings and with 110,000 miles on the clock. It sat dormant through most of the '80s, and escaped both the first muscle car investment boom and several seasons of Dukes of Hazzard production untouched (West Covina is less than an hour from Hollywood).
Starting in the early '90s, though, Gonzalez discovered the wonderful world of cruise nights, and decided maybe he'd participate. And to do so in style, he decided, the ol' Charger would need a little refreshing. First came an engine rebuild--a purple-shaft cam, long-tube headers, a more free-flowing exhaust, a new radiator (quite visible in photos, Gonzalez admits, because he didn't know enough to retain the factory shroud to keep it looking stock), some refreshed suspension with new gas shocks, bigger wheels (15-inch chromed Magnum 500s) and tires (235/60s in front, 275/60s in rear), and then some paint and body work, flowing a new coat of Dark Green over the Charger's Coke-bottle flanks. (All of this work took place in bits and pieces over the better part of a decade.)
Mopar purists may recoil at the sight of a semi-gloss black engine compartment, but the simple truth is, the engine rebuild came before the paint--while in retrospect Gonzalez wishes it could have played out differently, it didn't. C'est la vie.
And we got to take it for a spin.
The olive green gut is just light enough that it feels more open than the dark, black vinyl shroud that generally envelops the cabin, and you with it, closing in around you with its claustrophobic clutches. At first, you can be forgiven for thinking you might be sitting in a lower-line Coronet: bench seat, column shift, no tach. Not terribly sporting, and at first blush not quite befitting something calling itself R/T. But then you can't have one hand on the wheel and the other around your lady when you're busy shifting; we can't help but admire this man who clearly had his priorities in line. The seat does its best to absorb you; ancient cushions and springs give way, as does admirably pliable four-decade-old vinyl. Inches of headroom are gained.
Turn the key, and the exhaust simply thunders, though if you strain you'll hear the sound of virtually every fuel-injected 5.0L Mustang ever owned by a teenager thanks to the aftermarket mufflers installed. Here, the traditional big-block Mopar rumble is given a curious new layer, higher up in the pitch range than you'd think 440 cubes could (or should) reach at idle. Whether it sounds right or wrong is not for us to say; we will say that it's not the sound that comes to your mind when you think big-block Mopar. Blip the throttle, and there's lots of noise to fill the cabin and scare the neighbor's cat.
Alas, it's not quite met with an accelerative force befitting the braying exhaust. There's no stumble off idle, no bad habits to indicate that it's out of tune. A mild power-brake at the light means you'll get going a little quicker, but still not as much as you'd think. Is it the 3.23:1 rear sopping the energy out of the driveline? Is it the extra power the 727 absorbs compared to a four-speed? Have all of the modifications somehow added more weight to this? Does your tester need to revert to diet beverages with lunch? Or have all of the modifications somehow conspired to make things less efficient and slow things down? Is it a combination? Tough to tell.
The tranny's shift action is entirely dependent on how you treat the throttle. Stomp on the pedal, and you can hold a gear clear through to what sounds like redline. Accelerate at, say, half-throttle, or even three-quarters, however, and the TorqueFlite will run through first and second and clunk into Drive the first chance it gets. Holding a gear is certainly a lot quicker around town (if not as fuel-efficient) than stomping the gas and awaiting kickdown would be. Shift action is consistently firm, but not violent, at all speeds, whether acceleration is moderate or a little faster going; as a result, it manages to feel a tad rough at around-town speeds while faster acceleration allows enough other sensory inputs that you don't notice it as much while at WOT.
The numb steering is a damned shame on a car that corners as flat as this particular Charger R/T does, even with its slight rake. It remains composed through the turns, though the steering--perfectly smooth whether operating with a single digit or two white-knuckle fists--offers Chrysler's usual power-assisted sensory-deprivation services, lest any untoward road feel make its way to the wheel. (The wheel also has a minor issue with trying to center itself that we've not encountered in other Mopars.) Surely the wide radials and the front anti-roll bar, nearly an inch thick, contribute mightily to this surprising and flat cornering attitude. We like it.
Power it through the turns, and marvel at just how tight this thing feels--a car that's had the suspension redone but hasn't been completely apart for a restoration, mind. Most of those bolts and all of those welds were installed in Highland Park in the fall of 1968, but the unit-body's remarkable solidity gives the impression of something much newer. Ride quality is good and controlled, allowing just the right amount of road feel to be transmitted into the cabin; as a bonus, there's no undue banging or clanking, as is sometimes the case with partly-rebuilt machines. If the steering could just be convinced to open up a little more and explain what was happening under the front tires, you could have a surprising weapon to shush through the bends and esses.
Gonzalez indicated that the "purple shaft" Mopar Performance cam took away all of the vacuum for his power brakes, and that he's added an electric pump to assist in the cessation of violence. "They told me vacuum would still be OK once I installed the cam," he mentioned as we drove. "It wasn't."
His solution works almost too well: the pump makes the brakes super-touchy even at speed, all too easy to lock up when you're not trying. At neighborhood speeds, it threatens to throw you through the windshield. After half an hour of not terribly ginger-footed in-town driving, accelerating away from stoplights and such, we cast a suddenly wary eye toward the temperature gauge. On that sweltering summer afternoon, the R/T's temperature never rose above 170 degrees--it never lost its cool.
So at the end of the day, our '69 Charger R/T is nearly original--and in some quite demonstrable ways, better. Whether the minor mods made here suit you (or me, for that matter) is beside the point. The owner? Completely original, and not about to change his mind or second-guess his choices. Nor should he.
Owner's View
"It never occurred to me to get rid of it, really. There was nothing wrong with it, so why should I? I was always able to garage it, even when I wasn't driving it, and now my youngest daughter has an interest in it. Plus, now I have grandsons, and they love it."--Luis Gonzales
Club Scene
Mopar Enthusiasts Car Club of America
moparenthusiasts.1afm.com
620-966-7974
Dues: free • (Web-based only)
PROS
+ Super-rare bench seat
+ Super-rare cornering
+ Super-rare original owner
CONS
- Bench seat in an R/T?
- Power steering: more like an Imperial
- Doesn't actually seem all that fast
Specifications
Price
Base price: $3,525
Price as profiled: $4,837
Engine
Type: OHV V-8, cast-iron "RB" block
Displacement: 440 cubic inches
Bore x stroke: 4.32 x 3.75 inches
Compression ratio: 10.1:1
Horsepower @ rpm: 375 @ 4,400
Torque @ rpm: 480-lbs.ft. @ 3,200
Valvetrain: Hydraulic valve lifters
Main bearings: 5
Fuel system: Single Holley 750cfm carburetor on Holley Street Dominator manifold, mechanical pump
Lubrication system: Pressure, gear-type pump
Electrical system: 12-volt
Exhaust system: Long-tube headers, mandrel-bent dual exhaust
Transmission
Type: Chrysler TorqueFlite three-speed automatic
Ratios 1st: 2.45:1
2nd: 1.45:1
3rd: 1.00:1
Reverse: 2.21:1
Differential
Type: Mopar 8¾-inch ring gear and housing with
Sure-Grip limited-slip differential
Ratio: 3.23:1
Steering
Type: Power-assisted recirculating ball
Turns, lock-to-lock: 5.3
Turning circle: 41 feet
Brakes
Type: Hydraulic, dual-circuit master cylinder, power assist
Front: 11-inch disc
Rear: 10-inch drum
Chassis & Body
Construction: Steel unit-body with subframes
Body style: Two-door hardtop
Layout: Front engine, rear-wheel drive
Suspension
Front: Independent; unequal length wishbones, torsion bars, tubular shock absorbers
Rear: Leaf springs (6 leaves left, 5½ right); tubular shock absorbers
Wheels & Tires
Wheels: Chromed steel Magnum 500
Front: 15 x 7 inches
Rear: 15 x 8 inches
Tires: BFGoodrich Radial TA
Front: 235/60R15
Rear: 275/60R15
Weights & Measures
Wheelbase: 117 inches
Overall length: 208.5 inches
Overall width: 76.6 inches
Overall height: 53 inches
Front track: 59.7 inches
Rear track: 59.2 inches
Curb weight: 3,900 pounds
Capacities
Crankcase: 5 quarts
Cooling system: 18 quarts
Fuel tank: 19 gallons
Transmission: 3.75 quarts (pan)
Rear axle: 3.75 pints
Calculated Data
Bhp per c.i.d.: 0.85
Weight per bhp: 10.4 pounds
Weight per c.i.d.: 8.86 pounds
Production
Dodge built 14,739 Charger R/T coupes for the 1969 model year.
Performance
Acceleration:
0-60 mph: 6.1 seconds
1/4 mile ET: 13.9 seconds @ 101.4 mph
Top speed: 130 mph (est.)
The 73rd annual O’Reilly Auto Parts Sacramento Autorama showcased over 500 custom vehicles this past weekend, closing out the big event on Sunday, May 5, by handing out more than 400 awards.
Among the car show award winners was Cliff Mattis who took home the prestigious Custom d’Elegance award with his immaculate 1957 Chevrolet Convertible built by Lucky 7 Customs. The channeled, copper-trimmed Chevy sits as low to the ground as possible and is powered by a vintage-look LS engine. Mattis also received $5,000 in prize money courtesy of ARP Fasteners.
Custom d’Elegance Award winner: 1957 Chevrolet Convertible owned by Cliff Mattis
The World’s Most Beautiful Lowrider was a new award for 2024, and Carlos Martinez took first honors with his lilac-painted 1964 Chevrolet Impala convertible named “Indigenous Angel,” featuring fabrication and assembly by American Muscle Cars, wheels and intricate engraving by Chavez Engraving, hydraulics by “Big Rob” Barajas and spectacular murals by Tim Lowery.
World’s Most Beautiful Lowrider Award winner: 1964 Chevrolet Impala convertible owned by Carlos Martinez
The familiar King of Kustoms award sponsored by Celebrity Kustoms was awarded to Mike McAuliffe and his 1953 Ford Victoria, which perfectly represented the elements required of the award, such as overall design, flow, quality and workmanship of bodywork, paint and interior. McAuliffe will receive a bespoke Jostens ring engraved with his name and car.
King of Kustoms Award winner: 1953 Ford Victoria owned by Mike McAuliffe
The West Coast Challenge Car Show Series presented by ARP Fasteners crowned its Grand Champion during the Sacramento Autorama for the second consecutive year. The Best of the West award went to Brent Schieder and his 1937 Ford Cabriolet. Schieder received a $12,500 prize, while second- and third-place finishers Scott Cooper (1970 Chevy El Camino) and Gary Holyoak (1932 Ford Roadster pickup) received $6,500 and $3,500, respectively.
Best of the West Award winner: 1937 Ford Cabriolet owned by Brent Schieder
“We brought together all the best parts of the Sacramento Autorama with a few new elements for 2024, and we are delighted with how Northern California’s incredible car community responded,” said John Buck, owner of Rod Shows and producer of the Sacramento Autorama. “This year, we celebrated hundreds of custom hot rods and muscle cars alongside lowriders, trucks, bicycles and more, and it wouldn’t be possible without the car owners and builders who bring their incredible entries to the show.”
Immediately preceding World War II automobile performance increased rapidly and this trend quickened during the post-war years, in part due to technology advances that were accelerated by the war itself. Unfortunately, safety enhancements didn’t keep pace with advancing performance or the exponentially increasing volume of traffic, so injuries and fatalities rose precipitously. In response to that, as well as certain high profile racing incidents, most notably the tragic crash at Le Mans in 1955 that killed more than 80 spectators as well as Mercedes driver Pierre Levegh, GM agreed to the Automobile Manufacturers Association (AMA) ban on all forms of motorsport. As of June 6, 1957, GM was officially out of racing.
This didn’t sit well with Corvette’s most ardent supporters at Chevrolet, especially engineer Zora Arkus-Duntov. In the years following GM’s adoption of the AMA competition ban Duntov and his co-conspirators continuously found innovative ways to keep America’s sports car competitive in production-class racing. Chief among these was offering, as regular or limited production options, high performance parts that anyone with the money and will could buy directly from their local Chevrolet dealer.
The fuel-injection fender emblems tell you this car is equipped with the potent 360-horsepower Rochester fuel injected 327-cu.in. engine, but nothing on the exterior indicates that this is an ultra-rare 1963 Z06 Corvette.
Photo: Richard Prince
When the second generation Corvette was introduced in model year 1963 this workaround to keep Chevy’s sports car racing in spite of the AMA ban manifested itself with an option package called Z06. A 1963 Z06 Corvette included virtually all of the same type of high performance equipment offered since 1957 but for the first time it brought all of the individual assemblies and components together in one option package. This initially included a 360-horsepower fuel injected engine, 4-speed manual transmission, Positraction rear axle, heavy-duty suspension (stiffer front and rear springs, stronger shock absorbers, and larger front anti-roll bar), heavy-duty brake system (heavier, vented backing plates, front cooling scoops, Cerametallic linings, finned drums, and dual-reservoir master cylinder with power assist), 15”x6” cast aluminum quick take-off wheels, and 36.5-gallon fuel tank. In December of 1962 however the aluminum wheels and large fuel tank were eliminated from the package and made separate options. This reduced the cost for Z06 from $1,818.45 to $1,293.35.
It's interesting to note that Z06 was initially available for coupes only but approximately concurrent with the deletion of the aluminum wheels and 36.5-gallon fuel tank the racing option package was also made available for convertibles. Chevrolet production records indicate that a total of 199 Z06 Corvettes were produced in 1963. The vast majority of these were coupes but it’s likely that a small number (fewer than ten) convertibles were built. Approximately 75 Z06 coupes were equipped with a 36.5-gallon tank. Whether or not any 1963 Corvettes, including any Z06s, left the St. Louis assembly plant with quick take-off aluminum wheels is uncertain because production of the wheels by supplier Kelsey Hayes was delayed owing to porosity in the castings and loosening of the retaining nuts. It is indisputable that some of the very first Z06 coupes, which were delivered to owners of experienced race teams, including Delmo Johnson (owner of Johnson Chevrolet in Dallas, TX) and Grady Davis (Executive Vice President of Gulf Oil), competed with aluminum wheels but these were supplied after the cars were delivered. Extant GM documentation relating to the wheels indicates that up to 13 1963 Corvettes may have been factory-equipped with them and if so, it’s probable that all or nearly all of these were very early pilot line cars.
Photo: Richard Prince
When the C5 Z06 model was introduced in 2001 it was available as a hardtop only, because this configuration was stiffer and lighter than the coupe or convertible.
Photo: Richard Prince
When unveiled for model year 1963, "Z06" was an option package and the nomenclature was consistent with the designations that GM typically used for its many options across all of its brands. Long before the term was revived in 2001 however it had transcended just another option code and came to symbolize an ultra-high performance, race-ready model designation. In other words, “Z06” took on a life all its own and came to be universally understood among enthusiasts as a very special model of Corvette. Recognizing this, Chevrolet formalized it with the introduction of a distinct Z06 model in 2001.
The C5 Corvette hardtop served as the starting point for Z06 because it was the stiffest (by 12 percent) and lightest (by 80 pounds) body structure being produced. Power for the C5 Z06 was supplied by the LS6 engine, which featured improved bay-to-bay breathing via cast-in windows in the block, pistons cast from high-strength M142 aluminum alloy, new, better breathing intake and exhaust manifolds, new cylinder head castings, a more aggressive camshaft, higher rate valve springs for a higher redline, and higher capacity fuel injectors.
All C5 Z06s were powered by an LS6 engine, which featured improved bay-to-bay breathing via cast-in windows in the block, pistons cast from high-strength M142 aluminum alloy, high-flow intake and exhaust manifolds, more efficient cylinder head castings, a more aggressive camshaft, and higher capacity fuel injectors. The engine was rated at 385 horsepower when introduced in 2001 but rose to 405 horsepower the following year.
Photo: Richard Prince
The LS6’s initial rating was 385 horsepower but that grew to 405 horsepower in 2002. The increase came from a new catalytic converter featuring reduced back pressure. With less back pressure engineers were able to make further gains in the induction system with a new air cleaner, a revised mass air flow sensor, and a higher lift camshaft.
All Z06s benefitted from a bespoke six-speed manual transmission, called M12. It had more aggressive gearing and a temperature sensor to help protect it from higher thermal stresses. Z06 also had its own suspension system, called FE4. It featured a larger diameter front stabilizer bar, stiffer rear leaf spring, and revised camber settings, all calibrated for better handling during high speed operation.
Rocker ducts that direct cooling air to the rear brakes quickly distinguish a C5 Z06 from the base cars.
Photo: Richard Prince
Z06 handling was also improved by virtue of special wheels and tires. Besides being an inch wider, the uniquely styled wheels were the most mass-efficient ever produced for Corvette to that point, which is to say their strength-to-weight ratio was the highest. These light-yet-strong wheels were wrapped with Goodyear Eagle F1 SC tires that were wider and stickier than the Eagle F1 GS EMT tires on coupes and convertibles. The Z06 tires were also lighter than their counterparts, reducing total mass by 23.4 pounds.
Reducing the weight of Z06 was a major concern for Corvette engineers, so in addition to lighter wheels and tires, Z06 also benefitted from several other unique features. The first-ever use of titanium in the exhaust system of a mass-production car saved 17.6 pounds and another 5.7 pounds was eliminated by means of a thinner windshield and backlight.
The stiffer structure, added power, more aggressive gearing, tuned suspension, grippier tires, and reduced weight yielded the fastest, best stopping, and best handling regular production Corvette built to that point in time. A C5 Z06 can hit 0-60 miles per hour in 3.9 seconds, turn 12.4 second quarter miles, peak north of 170 miles per hour, and generate 1.03g of lateral acceleration.
The C6 Z06 was offered only as a coupe and under the skin differed markedly from its base counterpart by virtue of an aluminum body structure.
Photo: Richard Prince
One year following the 2005 introduction of Corvette’s sixth generation a new Z06 was made available. The hardtop body was discontinued so the C6 Z06 was offered only as a coupe. The heart of this Z06 was a small new block engine dubbed LS7. It featured a 4.0-inch stroke and 4.125 inch bore that together yielded 427 cubic inches. For maximum durability LS7 used forged aluminum pistons, a forged steel crankshaft, and forged titanium connecting rods. These exotic rods were 30 percent lighter than the steel rods used in the base Corvette’s LS2. Six-bolt main bearing caps secured the crank, and a dry sump lubrication system ensured its bearings got a steady stream of oil. The stout short block was capped with CNC-ported aluminum heads and a composite intake manifold. Each LS7, hand-assembled by an individual master engine builder in GM’s new Performance Build Center in Wixom, Michigan, produced 505 horsepower and 470 pound-feet of torque.
The hand-built LS7 was mated to a revised Tremec T56 six-speed transmission, featuring stronger internal parts to survive the engine’s power output. Likewise, the Z06 chassis, crafted from aluminum instead of steel like the regular C6, was upgraded with stiffer springs and recalibrated Sachs shocks, a larger diameter rear anti-sway bar, and larger Speedline wheels wearing Goodyear F1 Supercar EMT tires, sized at 275/35ZR18 up front and 325/30ZR19 in the rear. For upgraded stopping power the Z06 got a new brake system. Up front, huge 14.0 inch vented and cross-drilled steel discs were squeezed by six-piston calipers while at the rear, 13.4-inch steel disks were fitted with four-piston calipers. Each piston in each caliper got its own brake pad, for a total of 20 individual pads. Though complicated, this unusual setup aided brake cooling and reduced the potential for uneven pad wear.
The Z06’s performance was advanced by lower overall mass in spite of some things that added weight, including its dry sump oiling system and larger brakes, wheels, and tires. The biggest weight savings came from the Z06’s aluminum chassis, which eliminated a full 136 pounds compared with the standard car’s steel structure. Carbon fiber front fenders, a floor made from balsa wood sandwiched between carbon fiber sheets, cast magnesium structures for the engine cradle and roof, and elimination of a removable roof panel together eliminated slightly more than 60 pounds. The use of less sound insulation for the cabin and substitution of manual seat adjustments for the otherwise standard electric seats cut another 33 pounds. All told, the Z06 tipped the scales at about 50 pounds less than a standard C6. This helped make the C6 Z06 the highest performing Corvette that Chevrolet ever produced until 2009, when the ZR1 was unveiled.
With a C7, for the first time in Corvette’s history, the Z06 model was available as a coupe or convertible. This was made feasible by advances in design, construction and materials that made the convertible body structure every bit as strong and stiff as its coupe counterpart.
Photo: Richard Prince
The seventh generation Corvette, introduced in model year 2014, was the ultimate expression of the marque’s front-engine architecture. In fact, the new C7 was so good that the base car delivered performance comparable to the C6 Z06. This raised the engineering goals for the C7 Z06 significantly and by all accounts the Corvette group really nailed it.
All of the exterior features unique to C7 Z06s, including its wider stance and rear spoiler, were driven by functional considerations.
Photo: Richard Prince
Corvette Chief Engineer Tadge Juechter directed his team members to aim for a new Z06 that equaled or surpassed C6 ZR1 performance in every category. This led to the adoption of a supercharged V8 for the C7 Z06. Dubbed LT4, the forced-induction mill delivered 650 horsepower from 6.2-liters of displacement, and it did so in a very efficient way that integrated smoothly with the overall Corvette assembly process. Key to minimizing changes to the C7’s structural design and assembly line flow was a supercharger compact enough to fit under the standard hood, yet potent enough to reach the engine’s power targets. Such a supercharger didn’t exist, so they worked with supplier Eaton to create one. The newly designed R1740 TVS was 10mm shorter and 10mm smaller in diameter than the LS9 supercharger found in C6 ZR1s, eliminating any need for a hood bulge. Though design changes such as different rotor spacing and higher speed – it spins up to 20,000 rpm, 5,000 more than the supercharger on the LS9 – yielded greater efficiency the smaller supercharger did squeeze less air than the larger unit used on the LS9, 1.74-liters of air per revolution instead of 2.3-liters. To meet the power goals in spite of lower boost the engine team devised a very efficient flow path going into the supercharger and developed an improved discharge port that minimizes turbulence, reduces heat and speeds up airflow through a more efficient intercooler.
With the C7 Z06, fresh ingested through the grille went through a tilted radiator and the supercharger’s intercooler before exiting out the louvered hood vent. By going up through the hood rather than down and underneath the car the airflow contributed to downforce rather than lift.
Photo: Richard Prince
While the Z06 LT4 was built with the same engine block as the base LT1 it used many bespoke parts to handle higher cylinder pressures and added horsepower. These included titanium intake valves, stainless steel cast exhaust manifolds, a modified cam, and improved pistons.
Similarly, the LT4 cylinder head design was essentially the same as the LT1 heads but the LT4 units were more durable. They were rotocast from a special A356T6 aluminum alloy that was stronger and better able to withstand high heat. Heat management was also aided by a larger capacity oil cooler for the otherwise standard Z51 dry-sump oiling system.
C7 Z06’s LT4 engine used a newly designed, highly efficient supercharger to help generate 650 horsepower from 6.2-liters of displacement.
Photo: Richard Prince
While all prior versions of Z06 were available only with a manual transmission, Chevrolet decided to offer the C7 Z06 with an automatic. The existing six-speed automatic was not strong enough so the transmission engineering group at GM Powertrain, led by Bill Goodrich, were put to work designing a new transmission. Compared with the six-speed automatic it was to replace, the new unit had to be lighter, strong enough to withstand the supercharged engine’s enormous torque production, no larger and preferably smaller, and better performing in all measures, and it had to do all of this at approximately the same cost as the six-speed. The result, designed with the aid of the most advanced computer tools then available, was an all-new eight-speed automatic that made extensive use of aluminum and magnesium.
The base C7 Z06 came with Michelin Pilot Super Sports while the optional Z07 package equipped Z06s got Michelin Sport Cup 2 tires. In both cases they were sized at P285/30ZR19 up front and P335/25ZR20 at the rear.
Photo: Richard Prince
In addition to the new 8-speed automatic, which was manufactured in GM’s Toledo Transmission plant, the new Z06 was also available with a seven-speed manual gearbox. As with the base Stingray, manual transmission cars came equipped with Chevrolet’s Active Rev Matching system.
All C7 Z06 exterior design changes, including its wider stance, were driven by functional considerations first and foremost. The base Z06 came with Michelin Pilot Super Sports while the optional Z07 package equipped Z06s got Michelin Sport Cup 2 tires. Either way, they were sized at P285/30ZR19 up front and P335/25ZR20 at the rear. Z06 got its own lightweight, spin-cast aluminum wheels measuring 19x10 inches in front and 20x12 inches in the rear.
Z06 designation on the bottom of the steering wheel immediately tells you this C7 is the high performance Z06 model.
Photo: Richard Prince
As a track-oriented car, added cooling capacity for the engine, transmission, differential, and brakes were another important consideration in the car’s exterior design. Very large front fender vents exhausted more air from the engine compartment and unique air blades over the inlets on top of the rear quarters channeled about 50 percent more air into the transmission and differential cooling ducts than those on the Stingray. The wider Z06 rear fascia had larger exhaust ports adjacent to the tail lamps to help move the added air volume out. Ducts that took in air at the corners of the grille cooled the front brakes while scoops in front of the rear wheel openings directed air to the rear stoppers.
Also consistent with its track focused design, the C7 Z06 was the highest street-legal downforce car GM every produced, and the highest they’ve every tested, which is to say it generated more downforce than any competitor car GM tested, including of course exotics costing many times what the Z06 cost.
All C7 Z06s had increased downforce by virtue of air ingested through the grille going through a tilted radiator and the supercharger’s intercooler before exiting out the louvered hood vent. By going up through the hood rather than down and underneath the car the airflow contributed to downforce rather than lift.
The LT4 used in the C7 Z06 was built with the same engine block as the base LT1 found in standard C7s, but it used many upgraded internal parts to handle higher cylinder pressures and added horsepower. These included titanium intake valves, stainless steel cast exhaust manifolds, a modified cam, and stronger pistons.
Photo: Richard Prince
Beyond the vented hood, exactly how much downforce a C7 Z06 produced depended on which of the three available aero packages it had. In its standard state the Z06 aero parts included spats around the front wheel openings, the aforementioned hood vent, and the same upright rear spoiler found on Stingray’s Z51 Performance Package. The second aero stage consisted of a carbon fiber package, available in either black or a visible carbon fiber finish. This package included a carbon front splitter with aviation-style winglets, carbon rocker panels, and a larger, three-piece rear spoiler with fixed wickerbills. The wickerbills are small, vertical tabs at the edges of the spoiler’s blow-molded center section that measurably increase downforce. The third and most extreme aero configuration came from the optional Z07 package, which included a number of special aero components. At the front owners could install either of two different size carbon winglets for the front splitter and at the rear there was a tall, center wickerbill that featured about 25mm of adjustment. This wickerbill was clear so that it didn’t interfere with rearward vision when adjusted to its highest position.
Though the C8 E-Ray accelerates quicker, the C8 Z06 offers the best all-around performance of any Corvette produced thus far.
Photo: Richard Prince
It was a foregone conclusion from its inception that the mid-engine C8 lineup would include a Z06. As with the transition from C6 to C7, the base model C8 delivers performance comparable to the prior generation’s Z06, so the C8 Z06 had to meet extremely ambitious performance targets. To achieve this, engineers optimized its engine, drive train, suspension, brakes, wheels, tires, and aerodynamic features.
After nearly seventy years of development Chevrolet’s small block V8 was approaching the limits of its power potential so engineers started with a clean sheet of paper and designed a highly advanced new powerplant for the C8 Z06. Dubbed LT6, this new V8 displaces 5.5 liters and produces 670 horsepower at 8,400 rpm and 460 lb-ft of torque at 6,300 rpm. These figures make it the most powerful naturally aspirated V8 ever offered for a production car.
The C8 Z06 engine is an all new design that uses a flat plane crankshaft to maximize power and efficiency. The nylon chambers atop the C8 Z06’s LT6 engine each have a volume equal to the engine’s 5.5-liter displacement. Three computer-controlled valves between the two plenums open and close to take advantage of the natural pressure waves induced by the action of the intake valves, allowing the amplitude of the air in the plenums to be magnified, which delivers volumetric efficiency greater than 100 percent.
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The new engine’s cylinder case and oil sump are made from aluminum and mated at the crankshaft centerline. In a stark departure from all previous GM engines the LT6 utilizes a race-inspired 180-degree flat-plane crankshaft. This type of crankshaft is lighter than a conventional cross-plane crank, which enables it to spin up quicker and rev higher. A flat-plane crank engine is also inherently more efficient because the exhaust pulses in each cylinder head are spaced 180-degrees apart, something that enables it to move more air through. This benefit is optimized with precisely designed, upward sweeping Y-shaped stainless steel headers.
Additional features of the engine that contribute to its incredible performance include forged aluminum pistons, forged titanium connecting rods, and four overhead camshafts with adjustable, computer-controlled camshaft drive sprockets that allow for 55-degrees of timing variability for the intake valves and 25-degrees for the exhaust valves. The engine’s aluminum heads feature four valves per cylinder and CNC machined intake ports and combustion chambers.
The C8’s interior - for all models, including Z06 - is the highest quality, in terms of materials and workmanship, ever offered for Corvette.
Photo: Richard Prince
The engine’s induction setup includes twin 87mm throttle bodies that meter air to molded-nylon plenum chambers. The chambers each have a volume equal to the engine’s 5.5-liter displacement. Three computer-controlled valves between the two plenums open and close to take advantage of the natural pressure waves induced by the action of the intake valves. By controlling these pressure waves the induction system benefits from a phenomenon called Helmholtz Resonance and magnifies the amplitude of the air in the plenums, effectively forcing the intake charge into the cylinders and allowing the engine to exceed 100-percent volumetric efficiency. This yields a torque curve that remains very close to peak output of 460 lb-ft all the way from 3,500 rpm to the LT6’s 8,600 rpm redline.
The LT6 engine is coupled to the base C8’s Tremec TR-9080 eight-speed, dual-clutch transmission but for the high performance Z06 it’s fitted with a lower, 5.56:1 final drive ratio for quicker acceleration. The electronically controlled limited-slip differential optional for Stingray is standard with Z06. GM’s fourth generation Magnetic Ride Control (MRC) suspension, introduced as optional for the Stingray in 2020, was also made standard with Z06. For Z07-equipped Z06s MRC gets a unique calibration that enhances track performance.
The C8 Z06 was optimized to deliver maximum track performance in a car that can still be driven comfortably on a daily basis.
Photo: Richard Prince
To take full advantage of the MRC 4.0 suspension Z06 is fitted with more aggressive bodywork that measures 79.7-inches wide, which is 3.6-inches wider than the Stingray. This provides the necessary clearance for 20 x 10-inch front and 21 x 13-inch rear forged-aluminum “spider” wheels, which are available in five different finishes. Michelin Pilot Sport 4S ZP tires sized at 275/30ZR20 and 345/25ZR21 respectively are standard fare while the optional Z07 package includes even stickier Michelin Sport Cup 2 R ZP tires that were developed specifically for Z06. In either case, the front tread is 1.18-inches wider than Stingray tires and the rear tread is 1.57-inches wider, contributing to the car’s superior handling and more aggressive appearance.
For increased stopping power Z06 gets a bespoke Brembo brake system, with larger 14.6-inch-diameter front and 15-inch-diameter rear rotors and six-piston front calipers, compared to Stingray’s four-piston calipers. Brakes are further enhanced with the Z07 option, which utilizes vented, cross-drilled carbon-ceramic rotors and compatible pads. The fronts measure 15.7 x 1.5-inch and the rears are 15.4 x 1.3-inch.
To contend with added heat a Z06 can generate when pushed hard on a track engineers specified several important cooling upgrades. The unique Z06 front fascia includes larger air intakes and draws clean air into a central heat exchanger, one of five located throughout the car to provide additional cooling air to the engine, brakes, and transaxle. The wider rear fenders also allow for larger air intakes than those found on the base car.
When equipped with the optional Z07 package and adjusted for maximum effect, a C8 Z06 produces up to 734 pounds of downforce at 186 mph.
Photo: Richard Prince
Besides adding cooling capacity, Z06’s bespoke bodywork also improves aerodynamic performance. And as with the C7 Z06, multiple levels of aerodynamic trim are available with the new Z06. The base setup features a front splitter and rear spoiler with a removable wickerbill that generates up to 365 pounds of downforce at 186 mph. Aero performance is enhanced with the optional Carbon Fiber (RPO CFZ) and Visible Carbon Fiber (RPO CFV) Performance packages. Corvettes equipped with CFZ or CFV can also get an optional Carbon Aero Package with large rear spoiler and front dive planes, which increase downforce. Called TOF/TOG, the Carbon Aero Package is required with the Z07 performance package.
The highest performing aero package for Z06 comes with option Z07, which includes a larger front splitter, front corner dive planes, a rear wing, and underbody strakes. When adjusted for maximum effect, the Z07 aero components deliver up to 734 pounds of downforce at 186 mph.
In a first for any GM vehicle, carbon fiber wheels are optional with the Z07 package. The one-piece composite wheels save about 41 pounds of unsprung mass compared with the standard aluminum wheels.
Every C8 Z06 engine is hand-assembled by one artisan who proudly puts his or her name on a plaque that mounts between the LT6’s nylon plenum chambers.
Photo: Richard Prince
When the Z06 option package was introduced in 1963 it set new levels of performance for Corvette. Over the six-plus decades since then Z06 models have continued that legacy, giving buyers a lighter, faster, better handling and quicker stopping car that is equally at home on the street or on a road racing course.