Ford 300 cid. I drove a 1979 F-100 custom with a 300 up front over 250K miles with never having a problem. No oil leaks, no smoke except for about 30 seconds after start up. I let my son use it to go to California, he totaled the truck in the desert. That was about five years ago. Whoever bought the engine from the salvage got a good engine.
Al
