Ford 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 blockwhich also includes everything else to make it that way