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if you are going to run propane only, then my logic tells me since propane is roughly the equivalent to 114 octane gasoline(minus some btu's), you should run about 10:1 compression to optimize the available propane btu's. i would also go with an advanced curve distributor to further optimize the propane. an rv grind cam would be about the highest lift and duration i'd go ( from talking to other guys with more experience with propane only ). they told me propane doesn't like a lot of cam. hope this helps...
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