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our engines never see more than 7800 rpm. 14 to 1 comp. could we use c12 instead of the c14 we always run. would we lose any performance or pickup any? john
 

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C12 will be fine. You may pick up a bit at the bottom end, but that would be it. C14 is generally for higher compression and rpm. The C12 sometimes makes a little more torque. You will be fine.
 
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