And it may be a stupid one but there's a guy selling +100 455 pistons. I'm building a 403 is there a shot in hell that these pistons will work? Just asking because they're cheap. Also my block is being bored 30 over so if that changes anything. If not oh well, no skin off my back.
yet another 403 question.
- Thread starter Solidhank
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.100" over 455 pistons are still smaller than STD 403 pistons. a STD bore 403 is 4.351" a STD bore 455 is 4.126" that's a difference of .225" . Compression height is different as well, the 403 is 1.615+/- ands the 455 compression height is 1.740"+/-. That's a difference of .125" (1/8"). The compression height could be made to work but bore size negates that. Pin diameters are the same though.
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