In the early 80's I ran stock cast pistons in a 1969 360 HP 428 that came in my '65 GTO. It ended up breaking the lands out of 4 or 5 pistons due to detonation I never heard.
The engines I have rebuilt have all been with old-school forged pistons and they seem to last forever. I agree that old USA factory stuff is going to be head and shoulders above newly produced stuff of the same construction.
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Jeff 
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