It takes lots of abuse, or neglect...or jst a butt load of miles, to kill one of these motors.
Acording to the dope smokin old man, (the guy i bought my GMC off of) the original motor in my truck (305 V-6) died just shy of 400,000 miles, and he put another 100K on it after they put in the 400.
The V-6 was the base model motor on these trucks, I think 69 and older. You can tell if it is a V-6 truck by the vin...the second diget will be an M.
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