here a video of a car with a plane engine in it http://youtube.com/watch?v=IFTvObTPaQI that somthing like waht I want to do

how many gallons can you get out of one, do you have to shim the valves, what do you have to do as far as maintance, basicly I know nothing about fourstrok engines, and need to know everything or atleast as much as I can. so is there like a FAQ thread or somthing that tells all this?