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			Chevrolet doesn't seem to care much about 53-year-old engineering info. Plenty of Chevrolet engineering documentation was published in the Chevrolet by the numbers books. 
 Today you can visit the GM Heritage Center and request a part drawing. If they can locate it, they will provide a copy.
 
 I have the 2022 Chevrolet Performance catalog. The ZL-1 block casting is noted: DISCONTINUED-Check dealer stock for availability.
 
 I am curious as to what the difference was between the 3946052 and 3946053 cylinder blocks.  Put me down for $20 US.
 
				__________________Learning more and more about less and less...
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