Posted by Jon Hagen on April 04, 2016 at 14:40:47 from (64.68.4.241):
In Reply to: Re: nice old pickup posted by Tom in Ga on April 03, 2016 at 17:26:12:
I still have a running 67 GMC tandem truck with the BIG 478 CI V6 The thing has a very long frame and has an Allison 6 spd auto trans. We used it for a seed / fertilizer tender, but in it's former life it was an airforce fuel tanker truck. It still has the driveline splitter box and big centrifigal fuel pump it would use to pump jet fuel into a B52.
The V6 478 has a huge 5-1/18 inch bore size, makes a Chevy 427 / 454 look downright puny at a 4- 1/4 bore size. Fuiel economy as a frain truck was right at 2 mpg.
In later years of the GMC engine family, they replaced the overly long and complicated V12 702 with a huge V8, the 637, basically a 478 V6 with two more cylinders added.
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