Quote:
Originally Posted by b-man
Side loading of the piston is the biggest issue with the 4.5” stroke, along with the short cylinder of a Pontiac block pulling the piston down out of the bottom of the bore. Short piston life and quickly diminishing ring seal I’m thinking.
To end up with the same 1.57:1 rod to stroke ratio as a stock 455 which ain’t that great to begin with (6.625” rod - 4:21” stroke) you would need a rod close 7.1” long with that 4.5” crank.
Is it possible to put a rod that long into a stock deck block or would you need to go to a tall deck block? I’m thinking there’s no way to move the pin that far up into the ring pack on a stock block.
Makes me wonder exactly how GTO Jones is getting away with that 4.75” stroke in his 571. Which block standard or tall and what rod length?
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Your spot on.... 7.1 won't work