I used to have a '71 CL 450. I bought it with a holed piston and I had to rebuild the engine. As I recall, and I wouldnt trust my memory all that well, there are 2 styles of pistons. I seem to recall that one style would have inadquate valve clearance with earlier bikes ( or maybe it was the other way around.) There is a 450 list on the internet that I used to belong to but I cant remember the address. Do a search for Honda 450 and it should pop up.
mikeyrx
black bomber pistons
450 pistons"a free motorcycle is a bottomless hole intended solely for money"
66 CB 77 76 BMW R75/6 99 GL 1500 trike 75 & 79 XS 650's
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