The head casting numbers are 2658920-2 which I think was mentioned in a previous post. Anyone have a spare? Not sure we need to replace both if we use the same casting and rebuild it.... Is my thinking wrong?
As long as no one has done any porting or other creative removal of metal from the I/E passages and the combustion chambers, you should be fine. These old heads did not have hardened valve seats. If you install them on one head, you'll need to do the other, too. But you already knew that.
