I've never ran any numbers on my engine for "dynamic" compression, but it easily manages 87 octane fuel at 10.99 to 1 static compression ratio.
The build is a 428 block, 455 crank, std 455 bore size, exactly zero deck height, and SD's Old Faithful 236/245/112 HR camshaft. ICL is 109.5 degrees. The OF cam is around 292/308 duration seat to seat, nearly as I can remember.
Cranking pressure is right at 198-200psi in all cylinders.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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