GMC used different engines than Chevy in trucks built inthe states, and the same Chevy engines in Canadian trucks. I'll cover the US built GMC Truck Engines.
1960-1966 GMC standard engine was a 305cid V6 1960-61 was the 305A, 1962 the 305D and 1963-1966 the 305E. in 1966 the 351E V6 was offered as an option. 1964-65 the Chevy 230 inline six was also an option. in 1966 it was the 250 inline six.
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6066 GMC Trucks .
