Milling 225 head
I really doubt the compression ratio was 8.2.........
You need to take measurements to determine what the actual compression ratio is currently............
I thought the same thing... but looked up the numbers, and it worked out in the low 8's. Check these numbers:
Deck height 10.680"
Stroke: 4.125"
Rod length: 6.700"
Compression height: 1.740" (244NP's)
Head gasket thickness (original shim type): .021"
Combustion chamber volume: 54 cc (from Doug Dutra's worksheet in his 'Stroking' article; I have never measured one myself)
Distance below deck works out to .178" (seems pretty normal for a /6)
With flat top pistons, SCR works out to 8.32:1 .
The one variable I am not 100% sure of is the combustion chamber volume and the pistons in the OP's engine. If the combustion chambers were 60 cc's instead, the SCR before cutting would be 7.83:1. Either way, the OP will be going up almost a point in SCR with cuts of the level discussed. So does he want 1 more point, or exactly 9.2?
Dartman, part of what you are fighting is the newer, thicker head gaskets. If you have one, then your .100" total deck + head cuts works out very closely to my prior computations. It would take .090-.100" total cuts to get to the low 9's with a thicker head gasket.
