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I have been plannjng to add a belt blower or turbo to my red 66 charger. It is 11.5ish to 1 and even with a fat cometic gasket I'd be in the danger zone on race gas. I was told to stay under 10.5, preferably 9.5:1 under 15 lbs of boost. My understanding through research is that high...

On my iron headed 451 I backed the timing to 30 from 36 for a 150 shot with good results. I think it might have like a little more timing. A split cylinder wall ended that particular experiment.