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I am going to dig out my burret and see if these are what the online chart says, they look similar to a 59 a head as far as the chamber over the piston. I looked at many war surplus heads and the 81T, 81 A and 99T , the chamber over the piston is farther away from the centering point ,same as 59 a. design and the valve pockets have a lower area over the exhaust side and higher over the intake side, and these are definitely New old stock and not filled. Ill try and get this done today and let you know what I find, if they are not the 62 cc chamber I can always use them on another engine , I was trying to avoid spending 800 plus dollars for the aluminum aftermarket heads.one of these have a casting flaw that I hope will not cause a problem, I am still looking for one more 41 T head to make a set for another project.
Fordestes