GMC’s 1960 V-6-powered trucks were the original professional grade

[Ed Snyder]

Nice article in Hemmings about our trucks.

https://www.hemmings.com/stories/art...ign=2020-11-18

Lots of comments below the article too -- mostly good but a few not so good.

[BillT]

Originally Posted by Ed Snyder

Lots of comments below the article too -- mostly good but a few not so good.

I'm a big fan of GMC V-6's. Drove a '62 6500 with a 478. Great, tough truck, great reliability. We also had other V-6's, 1-Tons, 3/4 Tons and 1/2 Tons in our fleet. A '62 305 did get a cracked block once. Even liked the 637 V-8 in our 9500. But in my personal truck, a '66 1000 Pick-up with a 305 V-6, I had pretty horrible luck with it. Just one of those freaky things I would say.

[Funky61]

Great article Ed, thanks for Posting. I enjoyed the stories and comments that followed as well

[Jim A]

Great article, I always like to read good things about my truck of fifty years.

It is a little hard to believe, however, that the cooling system pumps 141 gallons per minute. That seems exaggerated.

[Ed Snyder]

Originally Posted by Jim A

Great article, I always like to read good things about my truck of fifty years.

It is a little hard to believe, however, that the cooling system pumps 141 gallons per minute. That seems exaggerated.

That 141 GPM is definitely exaggerated. The original brochures I have from the 1960s say that the flow rate was only 135 GPM at 3400 RPM.

[Jim A]

Ed
Even 135 sounds high.
That works out to recirculation of all coolant every 18 seconds, which would be the time for total loss if the top hose goes.
It is a pretty big pump though.