equipment necessary to go World Challenge racing. Built right on the Bowling Green assembly line, R9G Corvettes came with the FX3 adjustable suspension,teamed with the Z51 heavy-duty springs and brakes, a non-standard combination that year. The standard cloth interior was also installed, since the seats would be replaced by a racing bucket and harness. The stock aluminum wheels were replaced with the light but tough Dymag alloy wheels that proved themselves so well in the Corvette Challenge.
    Under the hood came the standard L98 engine, but Corvette Engineering sold a specially built L98 through its Raceshop for $4500.00. This special engine was built right on the Flint engine line, making it "showroom stock." "What we’ve done is kind of an automated way to blueprint the engines," said Mark DuPree of the Raceshop in a 1990 interview. Corvette Engineering selected blocks, heads and crankshaft castings with better than normal production tolerances,