Re: Canadian Heads
It sounds like the chambers are close to equal (if your method of measuring was consistent). If such is the case, there should be no problem running the mismatched heads. Even if they're not, in my opinion, it would still be OK.
Good luck in finding a "match" for either one; as somewhat a connoisseur of Canadian aluminum 8BA components, I can tell you they are quite scarce, and anybody that has them will be loathe to break up a set. I have also found that usable pieces are quite expensive. I have tried to match single 8BA heads twice in my life. The first time I ended up selling the single, and the second is now a "wall-hanger" in a good friends shop. I believe the best thing to do would be to massage both heads to optimize quench and compression and do what you want with the id marks.
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