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Glad to see you're thinking along those lines. I wondered about that too. Here are the bore to stroke figures:
302 4.0x3.0 ratio = 1.33
351 4.0x3.5 ratio = 1.14
427 4.23x3.78 ratio = 1.12
429 4.36x3.59 ratio = 1.21
460 4.362x3.85 ratio = 1.13
chevy 350 4.0x3.48 ratio = 1.15
The 427 actually comes in with the least oversquare bore (guess that's why it revs so well). Still, that could be part of it. But some of the others are soooo close it is a hard sell. I'll stick to horsepower as the cause (or effect).
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