looking at the Yenko documents it looks like they bought about 200 of the ZL-1 blocks from the Winters Foundry after 1974.
These were required by SCCA for the Corvettes that ran the ZL-1 engine.
The other Yenko aluminum blocks were not legal to race in the SCCA Corvettes at that time.
Zora and Vince Piggins were involved with getting the blocks made.
The part number 3946052 is listed as the "cylinder and case rough "
The part number 3952318 is for the "cylinder and case assembly "
The 3952318 assembly has a parts list of about 20 parts including bearing caps and bolts, plugs, dowel pins , cam plate, and other small parts.
These Yenko documents are in the Mark Gillespie 2nd Yenko Era book. Includes a hand written note from Vince Piggins.
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