Quote:
Originally Posted by blackadder
If I use 455 pistons will that not just be a 455? I have all the parts to build a 70 455 HO that are new less the block. A fella south of me has a 70 455 .030 over coded Hi HP block which will match the pistons I have but its rather $$. Cannot a 455 crank run 421/428 rods and pistons ? Or is the stroke an issue although I believe the deck height of all Pontiac engines is the same, but could be wrong. I am under the impression that adding just the crank from a 455 to either engine will yeild a 440 CID motor approx. Thanks for all the replies so far.
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ALL 3.25” main Pontiacs run the same rods. The difference is in the compression heights of the pistons. To use a 455 crank you must use the appropriate 455 pistons or a custom piston with the correct compression height useless you are using standard bore 455 pistons (4.1510).