Chevrolet produced other, different; aluminum big block castings that were not part of the ZL-1 program. Some were never sold to the public, provided to Chaparral and McLaren for their race cars. As of early 1968, they began development of an 'aluminum block L-88' that later became Corvette RPO ZL-1 for the 1969 MY. Due to poor sales, the ZL-1 program ended July 1969.
Chevrolet continued to develop aluminum big block castings for racing without liners or provision for a mechanical fuel pump. These were sold as bare blocks only, never used in production. Those and Yenko blocks are not considered ZL-1s.
The only true ZL-1 castings are 3946052 and 3946053, as used in 2 production Corvettes and 69 Camaros.
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Last edited by William; 08-01-2022 at 10:09 PM.
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