The Corvette ZL1 from 1969 was the rarest production model ever made, with only two units ever produced in the US. The ZL1 featured a powerful, all-aluminum engine based on the 427 ci L88 V8 ...

Chevrolet had a "no racing" policy, but engineers wanted to build the ultimate Corvette, and the ZL1 package was the result. Chevrolet claimed that the ZL1's L88 V8 engine only made 430 hp ...