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does any body now how far you can build an engine and still run it on propane can you help

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Comment by Joe Nichol on January 14, 2012 at 8:45pm

The good thing about propane is the 110 octain rating. You can run 11to1 compression on the street. You need more ign timing thow ( 43 to 45 deg total advance ) The problem comes with the propane carbs, most are to small. ( 425 cfm ) You could run a duel quad manafold and have 2 carbs. (850 cfm) might be a bit to much for a 350 unless your eng is 500 h/p or more. I have seen a commercial 650 cfm propane carb. (only ever seen 1 of them ). Goodluck.

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