The guys around here use the tall deck truck motors to build 540 cubes. The truck motors also use 4 ring pistons, so nothing good in there either. Dad had one of these for a log truck for a couple of years but it had a bad habit of busting pistons. He finally went to a DT466 and never went back to gas. If you buy it and want to start a fleet, I have a 72 with a 366, working 4th 5speed and air brakes.