Lingenfelter 402 C6 Corvette

Lingenfelter 402 C6 Corvette Lingenfelter 402 C6 Corvette
Specialty File

We have no doubt that our February issue prompted heavy breathing among many gearheads. That installment featured coverage on no fewer than eight vehicles with at least 265 horsepower, three with a minimum of 425, and two that were smuggling 500. That's the kind of artillery we usually reserve for one of our supercar shootouts. We're also confident that pages 74 to 76 were quickly dog-eared—that spread presented photos of a bright-yellow 2006 Chevrolet Corvette Z06, a 500-hp banana fast enough to split two scoops of vanilla without getting streaked.

What makes the new, Kentucky-built Z06 so special is that it carries exotic credentials at an everyday price. Generally, cars whose résumés boast titanium connecting rods, a forged crankshaft, a dry-sump oiling system, six-piston front brake calipers, front fenders made of carbon fiber, and an aluminum and magnesium frame cost upwards of six figures. Not the new Z06. It's expected to be less than 65 large. Lest you think that's too much for a car from the bow-tie division, consider that that sum buys the aforementioned 500 horses (at 6200 rpm) as well as 475 pound-feet of torque (at 4800), and according to our performance predictions, ratings of 0 to 60 in 3.8 seconds and a quarter-mile score of 11.7 seconds at 127 mph. The only other domestic-built sports car to put up similar qualifications is the $143,345 Ford GT, which hits 60 in 3.3 seconds and the quarter in 11.6 at 128. With just a vague grasp of arithmetic, one can deduce that the new Z06 offers substantially more bang for the buck.

Whether you have the bucks or not, you won't be able to enjoy the bang from a new Z06 until this fall, some six months after this issue gets hoisted from newsstands. But what if all the Corvette crazies out there didn't have to wait for the new Z06? What if a Vette with Z06-like performance existed right now? Would that pique some interest in Corvette clubs? It piqued ours.

When Jason Haines from Lingenfelter Performance Engineering (LPE) gave us a ring and asked if we'd like to test the company's modified 510-hp 2005 C6 Corvette, we said, "How does yesterday sound?"

As its name suggests, the 402 C6 Corvette features an engine that displaces 402 cubic inches, in this case a tweaked LS2 V-8 from the current Corvette. In the LPE, the 16-valver actually displaces 403 cubic inches, but the Indiana tuner liked the sound of 402 because it was a popular size among small-blocks of the past. (It's the same reason Chevy refers to the new Z06's 7.0-liter small-block as a 427, even though its cubes add up to 428.) To achieve its 402- plus- cubic-inch displacement, the Lingenfelter 6.6-liter has a 9.6mm-longer stroke and a minuscule increase in bore (101.7mm versus 101.6). Complementing the larger cylinders are a forged crankshaft, forged pistons, billet connecting rods, CNC-ported LS2 cylinder heads with a slightly higher 11.0:1 compression ratio (versus 10.9:1), and Comp Cams dual valve springs with titanium retainers. Comp Cams also supplies the hardened pushrods and the hydraulic roller camshaft. Other enhancements include LPE heavy-duty rocker-arm stands, ported exhaust manifolds, a 3.54-inch throttle body, and an LPE high-flow cold-air intake system. All told, LPE added $17,938 worth of engine mods. Exhaling through a Corsa stainless-steel exhaust, the custom engine puts out 510 horsepower at 6000 rpm and 500 pound-feet of torque at 4600—increases of 110 horsepower and 100 pound-feet—ratings verified by an LPE engine dynamometer report that, along with a chassis dynamometer report and a two-year/24,000-mile warranty, is included.