GMC 305 V-6
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GMC 305 V-6
Anyone have an old GMC V-6? I've always been a Ford fan, but i think GM used to build a good engine back when GMC was a different engine than chevy. Anyway i have a 305 and NP435 out of a '68 GMC 2500. These things are a massive chunk of cast iron weighing 850lbs!
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GMC 305 V-6
There was also a 350 version of that V6 engine block. From what I heard, it only fits the three speed tranny. Massive torque builder but it was definately not built for speed!
Ken Payne
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Ken Payne
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GMC 305 V-6
Those old GMC V6's were great. That particular family had the V6 305 (A-E variations), V6 351, V6 401 and V6 478. Then there was the monstrous 12 cylinder 702 which was more or less, 2 351's.
The 305 only had 150-165 HP, but torque ranged from 260-280 lb ft in the 1400-1800 RPM range.
The 478 was a bit of an outsider in the family because it had a longer 3.86" stroke vs the standard 3.58" stroke on the rest. Thus the torque figures for the 478 come in around 440 lb ft @ 1400 RPM. Now that's low end torque!
The 305 only had 150-165 HP, but torque ranged from 260-280 lb ft in the 1400-1800 RPM range.
The 478 was a bit of an outsider in the family because it had a longer 3.86" stroke vs the standard 3.58" stroke on the rest. Thus the torque figures for the 478 come in around 440 lb ft @ 1400 RPM. Now that's low end torque!
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GMC 305 V-6
I had a GMC dual-axle 22' flatbed with the V6, five-speed and two-speed axle. Used it to deliver concrete block and elevator weights, and towed a large forklift at the same time. It was possibly the best pulling truck I've ever driven, and when I opened the hood there was this little V6 in there to surprise anyone that saw it.
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GMC 305 V-6
How old are you talking about. My uncle has a 65 chevy wrecker with the 305 V-6. Incidently, I blew that engine up when i was 16. Only bacause I did'nt check the oil like he told me .
I was just curious on the age.
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I was just curious on the age.
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I always post this when the discussion comes around as to how a V6 can't make the same torque as an inline, or how big bore/short stroke motors can't make torque...
More info than you need. Look for the F700 in here.
http://www.6066gmcguy.org/
These motors ran from '60 to '74.
Replaced by the 350 V8 and various oil burners.
More info than you need. Look for the F700 in here.
http://www.6066gmcguy.org/
These motors ran from '60 to '74.
Replaced by the 350 V8 and various oil burners.
Last edited by 85e150; Oct 11, 2006 at 10:28 PM.
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