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Another question for TTP;
What head gasket thickness and bore diameter was the 12:1 measured with? Perhaps a thicker gasket and/or larger bore could help out some of us that have to run cheapy fuel?
Sorry for the delay in replying.
The head gasket can't be changed, but the base gasket we used is a Triumph OEM gasket which is thinner than the base gasket Cometic supply. So by using the Cometic base gasket you could drop the CR down by around 0.4 to 11:6.
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