cheezehead Posted April 3, 2004 Report Posted April 3, 2004 I had my head shaved 30thou just engine has an mx port souldn't my compression be higher than 120? before it was 145. elevation were I am is around 300ft Quote
SyNtAxx Posted April 3, 2004 Report Posted April 3, 2004 Hello, Porting will lower your compression some what depending on the port type and the amount of material that was removed from the cylinders. Nick Quote
boonman Posted April 3, 2004 Report Posted April 3, 2004 Did you have the porting done at the same time as the head mod? If so, there's your issue. Cold cranking compression numbers will lower with porting. However, with the head mod, your compression ratio actually went up. If you had the porting before, and just did the head mod, you have other problems? Did you re-use the head gasket? Quote
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