The 2006 Corvette

The Overview

The C6’s second year changed the coupe and convertible only in detail: XM radio folded into every stereo above the base US8, dual-stage frontal airbags with a passenger-sensing seat, a smaller 370-mm three-spoke steering wheel, chrome on the HVAC and radio knobs, a small GM badge on each rear fender, Titanium Gray leather and a Storm Gray top, and two Tintcoat colors, Velocity Yellow and Monterey Red Metallic, in place of Millennium Yellow and Magnetic Red II. The one mechanical change was the automatic: the 4L65-E four-speed gave way to the Hydra-Matic 6L80, a six-speed with a 32-bit controller, Drive and Sport modes and steering-wheel paddles, running a 2.56:1 axle for a 28-mpg highway rating; it cost $1,250 and 19,094 of the 27,749 coupe and convertible buyers took it, so for the first time more than two of every three non-Z06 Corvettes were automatics. The Z51 package lost its 3.15:1 axle on automatic cars but kept its close-ratio six-speed, brakes and coolers, and went into 10,338 cars.

The news was the Z06, revealed at Detroit in January 2005 and in showrooms that fall at $65,800 including destination: a fixed-roof hatchback coupe, developed by Dave Hill’s team alongside the C6.R, on an aluminum frame from Dana that was 30 percent lighter than the steel one, with a magnesium engine cradle and roof structure, carbon-fiber front fenders, wheelhouses and balsa-cored floors, a rear-mounted battery, three inches more width over 18 x 9.5 and 19 x 12-inch ten-spoke wheels on P275/35ZR18 and P325/30ZR19 Eagle F1 Supercar run-flats, a splitter, brake-cooling scoops in the rear quarters and a spoiler on the deck. Under the hood was the LS7, 427 cubic inches from a 4.125-inch bore and 4.00-inch stroke in a new block with pressed-in liners, 11.0:1 forged pistons, titanium connecting rods and intake valves, sodium-filled exhaust valves, CNC-ported heads, hydroformed headers, a dry-sump oiling system with an eight-quart tank and a bi-modal exhaust that opened a second path above 3,500 rpm: 505 hp at 6,300 rpm and 470 lb-ft at 4,800, with a 7,000-rpm redline, each engine hand-assembled at GM’s new Performance Build Center in Wixom, Michigan. Behind it a strengthened six-speed with its own cooler, 14.0-inch six-piston and 13.4-inch four-piston cross-drilled brakes in red, and stiffer FE4 springs, dampers and bars; the whole car weighed 3,132 pounds, 47 less than the base coupe. Chevrolet claimed 0–60 in 3.7 seconds, the quarter in 11.7 at 125 mph, 198 mph and 1.04 g, the fastest car Chevrolet or General Motors had ever sold, and 6,272 were built in the first year.

The Z06 paced everything in 2006: the Daytona 500 in February with Jay Leno driving a car in DuPont Hot Hues flames from Lemon Drop yellow to Sapphire Trance blue, the 90th Indianapolis 500 on May 28 with Lance Armstrong, the Corvette’s eighth time there, and the Allstate 400 at the Brickyard in August, the first Corvette to pace the NASCAR race. Corvette Racing marked fifty years since the Corvette’s first Sebring class win by winning the 12 Hours again, taking a fifth GT1 class win at Le Mans with Gavin, Beretta and Magnussen and sweeping the ALMS GT1 championships. Production fell to 34,021, 16,598 coupes, 11,151 convertibles and 6,272 Z06s, 3,351 fewer than 2005 but with a far richer mix; the Z06 alone outsold the 2001 and 2004 C5 Z06s. At auction in 2026 the 2006 Z06 brought $34,000 to $61,040 by mileage, with most between $38,000 and $55,000, and the coupe and convertible $10,250 to $34,000, most between $17,500 and $30,000.

The 2006 Corvette Story

While the 2006 Corvette base coupe and convertible were virtually unchanged from the previous model year, the C6’s sophomore year promised to propel the emerging supercar to even higher levels of power and performance. The introduction of the C6 in 2005 had surpassed the expectations of even the most discriminating critics, and propelled the Corvette beyond any that had come before it.

An automotive reviewer for Car and Driver magazine summarized the C6 perfectly when he was quoted as saying, “it seems reasonable to say that we’re in the golden age of Corvette.”

That’s not to say there weren’t any changes to the Corvette platform. Airbag sensing technology was embedded in the driver and passenger seats, allowing activation of the airbags only in situations where the vehicle’s seats were actually occupied.

The installation of an XM radio, which had been a $325 option in 2005, was made standard for the 2006 model (with the exception of Corvettes equipped with RPO US8, the base sound system). A smaller, three-spoke steering wheel replaced the 2005’s four-spoke unit.

The steering wheel, 370 mm (14.6 inches) across and 16 mm smaller than before, provided drivers with a better hand grip and improved turn-in when driving through corners. But all of these items were small changes. In fact, only two significant improvements would be made to the Corvette in 2006 – one that would affect the coupe and convertible platform, and one that would introduce a whole new vehicle to the Corvette family.

The one major improvement that arrived for the 2006 Coupe and Convertible was the introduction of a six-speed automatic transmission to replace the earlier four-speed automatic transmission. Electronically controlled by an internally-mounted, 32-bit processor, the optional six-speed automatic transmission included paddle shifters, which offered the driver the option of manually shifting the transmission while operating the car in “Sport” – one of two selectable transmission modes (the other being “Drive”).

Did you know? The 2006 Corvette Z06 Coupe included the all-new 505 horsepower, 427-cubic-inch small block V-8 engine which featured a racing-inspired dry-sump engine oiling system with titanium connecting rods, titanium intake valves and a 7000 RPM redline. Each of these engines was hand-built at General Motors’ Performance Build Center in Wixom, Michigan. It was opened in 2005 to begin building engines for the 2006 model year. The facility cost $10 million to create and was developed specifically to produce hand-built, high-performance engines.

The 32-bit electronic “brain” of this new transmission also governed shifting and utilized smaller “steps” between each of the gears for improved smoothness over the old automatic transmission. The additional gearing afforded Chevrolet with the ability to install a longer-striding 2.56:1 rear-axle ratio into the 2006 automatic models (the manual models kept the 3.42:1 ratio).

The introduction of the larger axle ratio was mainly to improve the Corvette’s fuel economy, though actual reports of how the change improved the car’s gas mileage were mixed. The EPA highway test resulted in a 2 MPG (Miles Per Gallon) increase, but city driving actually resulted in a loss of 1 MPG.

The other major and most significant improvement to the Corvette was the return of the Z06 model in early 2006.

By 2005, the Z06 name had already gained credibility with Corvette fans. When it emerged from the shadow of the Corvette FRC (Fixed Roof Coupe) in 2001, the Z06 (whose names can be traced back to the competition-prepared Sting Rays of 1963) transformed the Corvette from just a sports car to something far greater – a car that could contend with the likes of Viper, Ferrari, and Porsche. Yet while the C5 had “paved the way” for a new, sixth-generation Corvette, fans of the Z06 couldn’t help but question whether or not GM would make the decision to build another “super” Corvette and, if they did, what form it would take?

The answer came in the third quarter of 2005, when Chevrolet took off the camouflage wrappings and revealed to the world the most powerful Corvette ever built up to that point in the car’s spirited history.

Corvette Chief Engineer Dave Hill and his team developed the new Z06 from lessons learned with the C5-R race car in the American Le Mans Series and at the 24 Hours of Le Mans. Interestingly, the development of the C6 Z06 would also serve as a starting point for the creation of the C6.R, and would evolve in conjunction with the newest Corvette race car, demonstrating unequivocally the growing connection between the Corvette production vehicle and its race track counterpart.

The new Z06 was based on the 2005 hatchback coupe, with a concentrated focus on taking the coupe’s design and improving its high-speed aerodynamic performance. While the outward appearance of the car would strongly resemble the base coupe, the Z06 would receive some significant modifications to improve its overall structural strength. To start, the Z06 was developed with a fixed roof panel that would improve the car’s rigidity over its “targa coupe” counterpart. Moreover, the C6’s frame was re-engineered in aluminum, saving weight to offset the heavier engine, brakes, wheels and tires the Z06 would carry.

In addition to improved structural rigidity, the Z06 featured a number of other design cues that made the “super-Vette” readily identifiable from the base coupe. Up front, a slightly altered fascia was installed that included a cold-air scoop in the nose that fed cool, dense air into the intake. In addition, the lower air dam was deeper, incorporating a larger lower grille opening and functional front splitter to aid in down force (to that end, a small rear spoiler was also fitted to the rear deck above the center high-mounted brake light).

The size of the front wheel openings was increased to accommodate a pair of Goodyear Eagle F1 Supercar P275/35ZR18 tires on ten-spoke 18 x 9.5-inch wheels. The rear quarter panels received a pair of functional air scoops, located just behind the driver and passenger doors, which served as cooling ducts for the rear brakes. Much like the front fenders, the rear quarter panels included more pronounced flaring and larger wheel openings to house the even more impressive Goodyear Eagle F1 P325/30ZR19 tires, on matching ten-spoke wheels.

However, the rear wheels measured an impressive 19 x 12 inches, the largest rim/rubber configuration ever used on a Corvette up to that point. These tires, on 12-inch-wide rims, helped to give the car a look very similar to the C6.R race car.

Moving inward, the details that defined the Z06’s cockpit were fewer, but included a two-tone color scheme, a slightly smaller steering wheel, and different seats with larger, non-adjustable side bolsters. Like the coupe and convertible models, the Z06’s interior did come with a flourish of options that helped make it equally versatile on the road or the racetrack.

The Z06 featured heated leather seats, a leather-wrapped steering wheel, a premium Bose sound system with a six-disc CD changer, satellite navigation, GM’s OnStar tracking/assistance feature, and an XM satellite radio system. In some instances, the base model coupe actually featured options that the Z06 did not.

Gone from the Z06 interior were power controls for the passenger seat, and less sound deadening material. The latter of these items was intended to help in the reduction of the Z06’s overall weight as well as to provide drivers a more robust exhaust rumble inside the car – a quality that consumers of this type of car had come to expect.

In an interview with the editors of Consumer Guide, Dave Hill said (regarding the weight reducing processes used in the development of the 2006 Z06), “It’s like a whole different car. It was an extremely large stretch to take 136 pounds out of something that only weighed about 350 (pounds) to begin with – a revolutionary improvement.” In total, the 2006 Z06 weighed 3,132 pounds, 47 less than the base coupe despite its larger engine, brakes and tires.

If the car’s appearance was impressive to would-be consumers, the powertrain beneath the hood would be downright stunning. For 2006, the Z06 Corvette received a big, new V-8 engine. Carrying the official designation “LS7”, the new 427 cubic inch engine was designed to function like the big-blocks of the past.

The LS7 was manufactured by hand at the GM Powertrain’s brand new Performance Build Center in Wixom, Michigan. It featured a unique block with thin pressed-in liners that allowed a larger bore and stroke of 4.125 x 4.00 inches (104.8 x 101.6 mm). Its pistons were forged (not cast) and flat-topped for a high 11.0:1 engine compression ratio.

A forged-steel crankshaft with forged-steel main bearing caps worked connecting rods made of costly, lightweight titanium. Titanium was also utilized in the intake valves (which replaced stainless steel), pushrods and all valve springs.

Additionally, the intakes grew to 2.2 inches across, while new 1.61-inch exhaust valves were lined/filled with sodium to aid in heat dissipation and durability. The engine valve angles were narrowed from 15 to 12 degrees to provide optimal breathing, and the valve lift was increased to 0.591-inch.

A low-restriction air filter was specified to feed a new intake manifold that included a 3.5-inch-wide throttle body assembly. To provide smoother airflow through the manifold, all of its ports were CNC-machined to minimize any imperfections.

On the exhaust side of the engine, new hydroformed “four-into-one” headers were installed. These headers fed back to a pair of large, three-inch exhaust pipes mounted aft of the engine on both sides of the car. Each pair of these pipes fed into a “bi-modal” muffler system. When the Z06 operates below 3,500 rpm, a single pipe per side handles all of the exhaust flow. This is done to reduce the amount of noise the car generates during normal driving conditions. In turn, when the engine RPM exceeds 3,500, a vacuum-operated bypass engages and re-routes the gases through a second, nearly straight pipe for maximum power and minimum restriction.

To ensure adequate and continuous lubrication of the LS7 engine during vehicle operation, a new, racing-inspired dry-sump oil system was introduced. This oil system included an eight-quart reservoir.

While the specifications behind the Z06 engine sounded impressive enough, the real numbers were centered around how well the engine actually performed. In its inaugural year, the LS7 delivered a staggering 505 horsepower at 6,300 rpm with a 7,000-rpm redline (and a 7,100-rpm fuel cutoff), making it one of the few pushrod production engines ever to spin so fast. Torque peaked at 470 lb-ft at 4,800 rpm, and the engine produced more than 385 lb-ft from 1,600 rpm.

Like every Z06 before it (and unlike the C7 Z06 of 2015–19, which offered an eight-speed automatic, or the automatic-only C8), the 2006 Z06 came only with a beefed-up six-speed manual transaxle. Unlike the coupe and convertible models from the previous year, which offered both manual and automatic transmission options, the C6 Z06 would only be offered with a manual transmission. In addition to the transmission, the Z06 also received an uprated clutch, half-shafts, U-joints and limited-slip differential. Another race-inspired touch was a transmission oil pump that circulated fluid through a heat exchanger at the front of the car and a differential cooler, keeping the transaxle’s temperatures in check in hard driving.

In addition to its aluminum structure, the C6 Z06 found additional weight savings by utilizing a magnesium front engine cradle (replacing the aluminum cradle used on other Corvettes). The floor panels were carbon fiber over balsa, and carbon fiber was also used for the front fenders and wheelhouses.

The Z06’s brakes used 14-inch front and 13.4-inch rear rotors, all cross-drilled for cooling. Larger-than-stock, one-piece calipers were mated to these rotors. The front calipers featured a six-piston braking system while the rears included a four-piston system. All of the calipers were painted bright “Corvette Red” which was a defining characteristic of the C6 Z06.

Interestingly, the suspension system for the Z06 remained mostly the same as the base model coupe, featuring independent short/long aluminum control arms and transverse leaf springs. However, the Z06 suspension did feature different, higher rate springs, special mono-tube dampers and larger sway bars that worked in conjunction with the larger tires and wheels. The suspension system also featured an active handling system which allowed drivers to select various driving modes during vehicle operation.

Production Volumes

Naturally, the Z06 came with a more-robust price-tag than the coupe or convertible models, but it also provided drivers an experience behind the wheel that was on-par with many of the premier sports cars from around the world. The 2006 Z06 had a base price of $65,800 (including the destination charge, before options) against the coupe’s $44,600, a difference of $21,200. Yet, despite the dramatic price increase, the Z06 accounted for 6,272 units (18 percent of all Corvette sales) in 2006. By comparison, 16,598 coupes and 11,151 convertibles were sold that same year.

Racing: the 50th anniversary season

Corvette Racing marked fifty years since the Corvette’s first class win at Sebring in 1956 by winning the 12 Hours of Sebring again in March 2006, then taking its fifth GT1 class victory at the 24 Hours of Le Mans in June with Oliver Gavin, Olivier Beretta and Jan Magnussen in the No. 64 C6.R, and sweeping the American Le Mans Series GT1 manufacturers’, drivers’ (Gavin and Beretta) and team championships. The production Z06 and the C6.R had been developed side by side, and the LS7’s dry-sump oiling, titanium rods and 427-cubic-inch displacement came straight from that program.