2193980 is a 1952 to 54 302 engine block. I don't know what that other set of numbers is.
The casting dates on the two GMC engines I have are below and to the rear of the second freeze plug from the front on the driver's side of the engine. Mine have a small round raised area on either end of the number with a line in it to make it look like a screw head.
Last edited by Bill Hanlon; 03/21/2026 9:16 PM.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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