521 is 4.39 Bore x 4.3 stroke. yes, it is only .030" overbore.ngates0516 said:that sounds pretty reasonable to me. is the 521 a .030 bore, or is it a .060?
Another 64!ngates0516 said:Thanks alot guys, This is going in a 64 galaxie, Crites is the only headers i've seen made for a 460 in a galaxie so far, besides custom made ones. can they hold up to that much horsepower? i would get them coated also.