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olds 307 and 403 · 12-02-2006, 05:04 PM

The olds 455 is not a screamer with its big 3" mains. The 403 can spin just as high as a 455. The 403 has much better bore/stroke ratio, just the windowed mains hurt the extreme rpm ability.

12-02-2006, 05:04 PM	#14 (permalink)
olds 307 and 403 Junior Member Join Date: Dec 2006 Posts: 4	The olds 455 is not a screamer with its big 3" mains. The 403 can spin just as high as a 455. The 403 has much better bore/stroke ratio, just the windowed mains hurt the extreme rpm ability.