I have a EF XR8 motor sitting in my garage (for some time now) and for the life of me I cant find an engine number anywhere on the block. I've seen them at the rear of the valley cover b4, but on this one there's nothing there, it blank.
Is there anywhere else that they stamp these blocks ?

I am wanting to sell it but I dont have a number on it when people ask me for one.

engine number is at rear passenger side of block just above starter