This cylinder head and carburetor setup is from a early 1 1/2 to 2 1/2 LA gas engine. Has good 3/4 exhaust threads. Good spark plug threads. Good fuel line threads as well. Valves may need a quick lap job before installing for heat results. Has great original patina overall with no breaks or repairs that I can see. 2 7/8″ x 3 1/8″ 4 bolt hole spacing. I think this would be a excellent addition to your engine! See pictures for the absolute best description.