Most outrageous of all was the ZR-12, a C4 stretched eight inches to accommodate a Falconer V-12-the all-aluminum small-block-derived 90-degree pushrod engine used in marine, aircraft, and hot-rod applications. Chevy claimed a 4.0-second 0-to-60-mph time (MT, May 1992). The ZR-1 SS, aka "Snake Skinner," massaged a stock ZR-1 engine to 450 horses (hotter cam, better breathing) and lightened the body by 500 pounds with a Kevlar hood, Plexiglas hatch, and an aluminum-intensive chassis. The ZR-2 was a GM aftermarket proposal to sell kits for adapting a 454 marine engine to fit a C4 Corvette, generating ZR-1 performance on the cheap (MT, February 1991). Our focus here is on full-blown concepts and prototypes, but along the way there have been some cool mules wearing civilian Corvette duds over wondrous hardware that never made production.
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