ZL1 engine

[GMH454]

Good point. What is being discussed on this thread is the original casting for ZL-1s used in Vettes Camaros, and some racing teams, Penske, McLaren, etc.
After the first batch was done, some were put in cars, many set aside for warranty, others held back for over the counter, and others used for the chosen racing teams. I think Greenwood stated that he picked up the last 16 in around 74-75. After the first run the same casting was used to produce more blocks but beleive these were not dated as they were never intended for instalation in cars. Later Yenko used same cating to produce a series of Yenko blocks, and these have the snowflake altered in various ways.

What you are refering to is a Reynolds Block, designed for Can Am, although Grumpy used one in his 1970 Camaro. These should not be confused with ZL-1s.