I was hoping someone could point me in the right direction with an issue.

My father has had oil leak issues with a small block 400 Chev engine with aluminum heads. The heads he's using are aluminum Edelbrock Performer RPM heads, 6073. The oil leaks from between the cylinder head and the block on the outside (on both sides, same place).

My brother has practically the same issue on a Chev 350 small block with a Vortec head.

They are using the appropriate gasket and have put the heads in to spec.

Any solutions? He's getting ready to put different heads on but I convinced him to give the forum a go.

JP