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I have been told that it was to make the 402 and the 454 pistons the same size for standardization purposes, but can't be 100% sure about it. It seems that I also read it in one of my many books...
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I had heard it was emissions related. Over 400 ci engine had different requirements. But I've never seen docs on this, haven't seen exception like this, and like the piston explanation better.
