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I am runnning almost 10 to one with 302 casting heads on my 318 miledge motor. I would run higher compression and higher octane because the higher compression increases efficency and pays for the difference in gas prices. To run that high compression you need very tight quench witch also helps efficency. For a 273 I think the sp2p would work great.

Dave I took notice of your mileage machine awhile back & I want to pretty much duplicate it though a 273(block) might be hard(er) to come by & I think that you cant get pistons for it(& I do want quench) & I have a spare 318 I could start on.

live every 24 hour block of time like it's your last day on earth