Testing new stuff

[Protrucks]

Well it depends on the motor. If it is pre what? 1975 and has not got hardened valve seats then the motor probably will not be a good one to convert. Propane is hard on soft valves. If it has hardened seats then propane will clean the motor out for you and probably extend its life. Even motors with hardened valves will have the valves go out sooner than they would having been running on gasoline. But the rest of the motor will keep going and going. When its time to do the valves have the seats hardened and use stainless steel valves. The 69 orange flat bed I have had a ton of miles on that motor when I converted it over and it had black thick oil in it when I got the truck that the motor came out of. After about 3000 miles and two oil changes the oil now stays clean between oil changes. The dip stick at first had that burn dark look on it and now it shines and looks new. I don't know the miles on the motor? but its a lot I'm sure.