H 24 5
H = August ( A = Jan, B = Feb, etc)
24 = 24th day of the month. 1st thru the 9th is just a single digit.
5 = 1945 probably. There were 248 engines made in 1955, but Aug 24, 1955 would be very close to the end of 248 production.
'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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