[SuperNovaSS]

Max,

The main caps are aluminum and I assume they are aftermarket. They are simply stamped 1,2,3 and 4 to mark their positions. The other ZL1 block I have has cast "964" caps like cast iron blocks have.

The oil filter is a System 1 unit with a removable mesh filter element. These are still available but I'm not sure if the design is the same as this older model.

I was told this block was purchased from a Chevy dealer 69 but the original purchaser has passed away so there is no way to verify.


Thanks,

Jason