Compression VS. Octane

RustyRatRod said
Mine has a measured 10.2:1. Dynamic is 7.99, but it STILL has over 175 PSI cranking pressure even with a big solid cam. It will run on 87 with no spark knock, but it runs SO much better on super, that's all I use now. Super most places is like a 50 cent increase per gallon. It's just NOT that much more.
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I opened up my valve clearance to .013 and .022 hot to increase fuel mileage and am getting 165lbs cranking pressure. I also read somewhere that going much over 165 lbs can blow a head gasket. Are you using something special for a head gasket when increasing cylinder pressure?