Have you read Glenn Woods' brief article under the Tech Tips on this website. He has a cool 66 Chevy with a 327 running dual fuel propane and gasoline. He really does not get as technical as I wish he did. I read the entire Tom Jenning's article that Hedgehog sited in his reply. I remember when my Grandpa had his farm truck, a 62 F O R D C-600 cabover with a 292/4-speed/2-speed converted to LPG. The folks that lived across the street from me owned a LPG company and they ran their whole fleet, personal cars and all on propane. I find it interesting and would like some good, hard tech data that relates to a Stovebolt 6, but I guess not many other 'bolters on this site do, given that this thread died out a month ago. It's not for everyone. Does anyone else out there have a LPG powered vehicle? :p Decreased power offset by better tailpipe gases and a cleaner engine sounds good to me. Thanks, Frank50