Oh also if I wanted to swap the 430 for a 455 how difficult would that be ?
it's cake. externally, they're the same engine.
you're unlikely to gain anything with the swap though. most of the 455s are low compression engines ( factory rated at 8.5:1 or worse ) while all of the 430s are high compression ( 10:1 ) so what you gain in cubes you give up in compression.
if you ever do a rebuild make sure to look at the FAQ about oil passage upgrades and have a reputable Buick guy build it. if a Chevy guy puts it together it will probably grenade on you.
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Vladimir Lenin
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H.H. Goddard, Human Efficiency (1920)
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