Hi all, I found a set of 3514v closed chamber heads today, but each one has a different casting number. One is DOAE-N and the other is D1AE-GA. In a book that I have its say that they are both 61-64CC heads. Being different years, but the same size chambers can they go on the same engine can anyone vertify this. Second question when the book say 61-64CC does it mean that the combustion chamber can be anywhere in that range and its possibe to have an engine with 61CC on one side and 64CC on the other side?