Propane specs

[Demonknight]

I have botha 1979 B-700 (bus) that is running propane, and a 1966 F-250...if I go with propane on a re-built 390 what kind of compression, and or specs should I be looking for?

[65superduty]

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...