Ford Windsor 351 engines. These two engines were from the same project. The regular 351 came out of a 1978 Ranchero, and it was using oil, so it got pulled. The other 351 got put in the car, but the customer was using cheep pump gas on a high compression engine designed for racing, and broke a piston and cylinder wall. You will notice the pop top pistons in the high performance block which also includes everything else to make it that way. Get both and build yourself that mud runner, or put it in your classic Ford, and make it go fast!