Originally Posted by David R Leifheit (Post 65700)

Interesting idea. But not correct.
In 1963 only, GMC put an overlay (kind of a "decal" if you will) on some valve covers. Never heard anything about Scots having anything to say about "endorsing" it.



I don't think GMC put 283s in any of their trucks.
And I would guess it would make a difference as to what you want to do with the truck as to what engine to put in there. If you want it to pull or haul (ie. work) then the 305/351 are good choices. A lot of low end torque. If you are using it like a car, then maybe the 350. But why? Put a Chev. drivetrain in it and it isn't really a GMC anymore.
Unless you have a Canadian truck. GMCs built in Canada were, essentially, Chevrolets with GMC badging.

Originally Posted by Dazzoman (Post 65702)

I would get the 305-E which is a tad bigger .

Originally Posted by David R Leifheit (Post 65703)

In what way do you think the 305-E is "bigger"?

305A-305E are all the same displacement and use relatively the same parts.

The 351 is bigger, and oddly enough was stock in many 1966 GMC 1000 series trucks (1/2 tons). While the 305 was still put in bigger trucks, I had a '68 GMC 5500 with a 305E in it for a while.

Originally Posted by bluestreak1854 (Post 66158)

Oredigger, I have a 478magnum with a allison auto with everything need to install it-- has 8696 miles-- also have a 5peed main and 4speed brownlite with od a 305e also-- like to sell any of it

Originally Posted by bigblockv6 (Post 65705)

And GMC was never bought out by Chevy:pullinghairout:, that's impossible when both are General Motors products to begin with. This was all about cutting production costs and interchangeability between both divisions.:lolsmack

Originally Posted by Dazzoman (Post 65689)

Oh yes holiday traffic is horrible !
Hot tip for you - contact Tom at Tom myers truck wreckers in Miami Oklahoma and he will send you an original 60s bumper . I got mine from him ( not shown in my pic because I still had the OEM white bumper that I sold this week for $75 on the truck ) but now I have an OEM chrome bumper I got from him for 150$ he shipped it to me . So i pulled out the 305E V6 this truck had in it originally because it wouldn't miss an gas station , the 305E is an bigger one that most so you might not wanna do that unless gas isnt an issue .
Funny , in 60-62 , GM painted plaid shirt pattern on the valve covers of the light trucks and nick named it "The Scotsman" engine until they found out the Scots , known for their frugility would not ever endorse such an engine so they pulled that idea away ha ha ha !
In 1987 I put an 292 straight 6 in it and have drove it like that since and yes an big increase in mileage was the first notable thing (w/ that original Muncie 4 spd I left in there ) .
Well that muncie finally died this yr and I researched and found I could probably put in an NP440 4 speed ( with overdrive on 4th ) and the gas mileage was increased like crazy .
I have decided to put in an 350 v8 this month and its going to be perfect for that NP440 MY6 tranny .
All that to say you should get away from the v6 because of the gas .
**** , Chevy put 283s in your truck with the same Muncie tranny with no problems .
Today you could put an modern 350 in there w/ all the trimmings :-)

Originally Posted by hubarlow (Post 66218)

"The 305E is no bigger than the 305A-D. Only difference is that in 1968 they had 10 more horse power. Cam profile changed I think."

Not an expert, so I could be wrong on this, but my research seems to show that the difference between the A-D engines and the E series was better flowing heads and intake manifold, bigger two barrel carb, and bigger valves. There may have also been a change in the exhaust castings making them flow better too. Not sure about the cam... Maybe a change there too.