ZL-1 Block Marking Help

[iluv69s]

Jason, that is a bummer about the snowflake..that is what everyone always wants to see.

I hate to say anything is typical, but here goes. The cast letters on the rear flange and the stamped YS on the front are typical of Yenko blocks I have owned in the past.

I have owned yenko blocks with screw-in freeze plugs, and with push-in freeze plugs. Ive owned and them with a snowflake (with the L), with a YENKO letters cast in it, and also with the YENKO crest cast in it. So I hate to say 'typical' when it comes to these blocks !!

I have seen legit GM blocks with no date codes in them like this also....Just to check, are they aftermarket main caps? hard to tell by the pics. Any stamped numbers in them?

whats with the oil filter? never saw one like that? thats for the dry sump?


max