Greetings;
My 1966 Mustang 289 was very hard to turn before a complete rebuilt. After rebuilt, the Engine started fine and ran very smooth for 30 minutes, then suddenly shuts off abruptly. The engine will not crank and very hard to turn over by hand. If I wait few hours for the engine to cool, then will start right up and does it again. Oil circulation looks fine and reaching the cylinder heads. Appreciate your help.