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Originally Posted by 455Grandville
Wonder if a 389 was ever dropped in before GMC offered its own V6 -
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If they did it wasn't official. I have two GMC Master Parts Books, neither of which mention 370 or 389 Pontiac engines. Some people confuse the 370" gas V8 offered in the larger (550 series and bigger) 57-59 GMC trucks as a Pontiac engine, but it was actually based on the Oldsmobile 371" V8 of the same year.