440-3 or 12 valve CTD

[76WAGON200]

Propane was looking pretty good there for a while when fuel prices were way out of whack. I looked into that option as well and there are some pretty wazoo systems out there that do everything but your taxes. I have driven propane vehicles before and was impressed at how well they started in cold weather. Power wise, if the engine is set up specifically for propane it can make similar power and fuel economy as a gasoline engine too. Just be sure to have your heads converted to propane or the valves won't last long. Take a look at these sites that I found for info on parts and full systems. I had to look long and hard to find them. There seems to be a shortage of people still doing this stuff. http://www.propaneguy.com/www.propaneguy.com/Index.html

http://autoparts.rasoenterprises.com...products_id=67

[MoparNorm]

All good responces.I've also played with the idea of making the 440 propane(if I could just find a propane setup off of a irrigation engine)and saving the CTD for my 64 W300 with the service body.This truck will be worked it has already been upgraded to a Dana 60 L/S front and a 60HD L/S rear with 80 axles.I live in COLD(sometimes) country so starting is an issue(sits at work for two days at a time).

Just keep in mind that the propane conversion will effectively make the 440 operate as a 360 on gas.
Propane has more octane than gasoline, but 30% less BTU's so it's not as efficient as gasoline in both fuel economy and power.