Quote:
Originally Posted by steve25
So if you go .030” over to a bore of 4.150” and then to the 4.250” crank, when you use the -4 head at 91 CCs , then by my math using common numbers for deck height, head gasket volume and valve notch volume I come up with a compression of 9.39 to 1.
If you run the -8 head at 98 CCs then your at 8.88 to 1 in compression.
With that 4.250” stroke crank every 3 CC change will change the compression ratio by 1/4 point basically.
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Since the early 90's have always had 455 block surface squared & zero decked. That will add near an extra 1/2 pt of static CR.