Thread: Too much crankcase pressure, novice engine builder

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Aluminum heads by Trick Flow. The gas is 100% gas, no ethanol.

Originally Posted by NegativeZero

Aluminum heads by Trick Flow. The gas is 100% gas, no ethanol.

With 10:1 compression and Trick Flow heads I believe you'll be just fine with 91 octane, and I prefer non-ethanol fuel personally, for non-computer controlled vehicles or for anything that doesn't get driven a lot (everything I own!). Like Dave & Jerry said, doing the leak down test is a good idea, and if everything is OK there back some timing out and see if it makes a difference. Just my $0.02. There're a lot of smarter guys on here, and decades upon decades of experience!