1970 cl450

Hello all, I'm looking for some assistance on putting a cb450 cylinder head back together. I have 3 of them to do. one is a 1968, one 1970 and the last is a 1971. all three were stuck when i got them. I will have two cb450's and one cl450 when done.I Gotta get-er-Dun. I did one and I have done...