ZL-1 block versus Can-Am block?

[chet urbanek]

Here is some information on Yenko's ca am engine, I have owned this engine for 40 years, bought from an old drag racer, whose name is long forgotten. The engine now sits in my 1969 camaro, some call it a Yenko ZL1. It has the 4.44 bore with a 454 steel crank, ( near 500 c.i. ) The casting seems to read 3946052, same as a ZL1. I was told this is an early engine, that when Yenko bought the molds, chevy told Don to lose the winter snow flake, but forgot to tell him to change the casting number, which Do did changing it to 3946053. This engine has ZL1 aluminum heads, intake, with a 850 holly carb. pictures to comeAttachment 118460

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