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Message: <blockquote data-quote="96blak54" data-source="post: 1587473" data-attributes="member: 14727">Yes 10.9 static compression forced induced is a bit high and into a discomfort zone for 91 octane. In your compression mathematics did you include piston deck height and head gasket thickness/volume? If possible, add a small dish to the pistons by chucking into a lathe and dish out .010" or .020". Also thicker head gaskets will help to reduce static compression. Check the piston deck height, you may find your pistons are down below the deck, which will reduce compression too. Be sure to include those details into your math.The availability of E85 or E98 ethanol in a 55gallon drum is dag near everywhere these days. After you get the car up and running and you want some comfort, figure out what ratio to cut some E85 into a fuel blend specific for your car. It could be as simple as 1gallon E85 to a 9gallon tank of 91 octane too boost octane 1.5 point making it 94.5octane.Id suggest narrowing down the math, adjusting compression by headgasket thickness and piston dish</blockquote>