Got a compression question for yu guys?
07-13-2011, 08:20 PM
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Got a compression question for yu guys? Looking to get some head work done and was considering getting them milled 30 over but think im gunna be over 11:1 compression ,you guys think il be ok with PTV wit gm head gasket?
07-14-2011, 01:04 PM
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The only real way to know is to measure... but I think PTV be fine with the stock cam. There are some spreadsheet calculators out there that can give a decent estimate of what milling 0.030" will do to PTV and combustion chamber size.
The stock combustion chamber is 65cc, and milling to get a 58cc chamber puts you just under 11:1 with stock GM head gaskets. I don't know how much milling is required to hit that volume, but I wouldn't go any smaller than a 57cc chamber without a plan for more cam.
The stock combustion chamber is 65cc, and milling to get a 58cc chamber puts you just under 11:1 with stock GM head gaskets. I don't know how much milling is required to hit that volume, but I wouldn't go any smaller than a 57cc chamber without a plan for more cam.