The C4 ZR-1 Corvette, even some 30 years after its initial year of production, carries indisputable performance merit, the likes of which few can deny. In fact, the ZR-1 is often cited as the car which helped fend off threats, both foreign and domestic in origin, to the Corvette's elite performance car status. However, after only 6,939 ZR-1 Corvettes were built, and 6 years of production had passed, the program was terminated, falling victim to decisions regarding pricing.
Chevrolet's introduction of the LT1 in 1992 as the base engine in the Corvette phased out the L98 based Callaway Twin Turbo. Previously, Callaway Corvettes made their increased power through positive manifold pressure; now they made it through increased displacement and finesse. Initially called the CL1 or CR1, they designated the chassis they were built upon. They were based on the pushrod LT1 cars (CL1) or the 32 valve DOHC LT5 ZR-1 cars (CR1).
This car was created by Doug Rippie. His claim to fame was the Corvette Challenge Series. Rippie loved racing Corvettes in the US, but, his life-long dream was to take on the world-class marques at Le Mans. So, when Chevy introduced the C4 ZR1 the opportunity was opened up. Via his collaboration with MerCruiser and Lotus Engineering, all with Chevy’s blessing, the "Black Widow" program created special street and race versions of the LT5 engine. This engine made 525hp.
The actual Corvette Pace Car that served at the 79th running of the Indianapolis 500 was a near-stock LT1 Corvette Convertible, except for the mandatory safety features that were required by the Indianapolis Motor Speedway. The Official Pace Car cam equipped with strobe lights, a special roll-bar, five-point safety harnesses for the driver and passenger and an on-board fire suppression system. Chevrolet built just three of the actual pace cars.