Re: Engine Serial Number
FetchMeAPepsi, your truck is a light truck, a 1962 so the engine it should have is the 305D, which replaced the 305A in the engine line and the 305A was dropped after the 1961 model year.
Here is what you need to know about 305 V6 Engines,
305A 1960-1961 light duty engine.
305B 1960-1961 Med Duty truck engine
305C 1960-1974 Med & Heavy duty engine.
305D 1962 Light Duty engine. replaced 305A
305E 1963-1974 Light & Med duty engine. Replaced 305D.
Light duty engine had 3 piston rings, heavy duty had 4, but some light duty engine have been found to have 4 rings as well.
Light duty trucks 1000-3500 Most used the 305, with the 351 as an option.
Med Duty trucks, 4000-6000 you could find 305, 351 or 401 egnines in these trucks.
Heavy Duty trucks 6500-9500, most of these had the 401 or 478. 7000 series had the 702 V12 1960-1965.
All GMC Images & material contained on the WebSite were taken from publicly available sources provided by GMC to promote their Trucks from 1959 to 1974.
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1965 GMC 3500 Custom Rescue Squad {Black Built Bodies}
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