The Tuned Port Injection 305 cubic inch V8 engine was standard equipment in the IROC, but this one has had a few upgrades during a recent rebuild, including a Crower hydraulic roller cam, upgraded valve train, bigger fuel injectors, underdrive pulleys, and a set of long-tube headers to bolster the torque curve. The familiar Tuned Port Injection intake manifold is easy to recognize and the engine bay is very clean with most of the modifications being invisible. It’s at least as strong as the factory L98, and it retains all the good manners of the factory fuel injection system. The 700R4 4-speed automatic overdrive has an upgraded torque converter, which means the big V8 feels punchy around town but just loafs along at highway speeds, even with a set of 3.90 gears out back. A Magnaflow exhaust system gives it a very aggressive exhaust note that is just about right for a car like this. The undercarriage is also in fantastic condition

Lithia Springs, Georgia, United States