Newbie thinking about diving into a '65 GMC 1000

[jtrichard]

Yes that's a V8 upper bracket the tanks are wider...At some point in the trucks life someone has put a V8 rad in there as you can see with the lower brackets (also wider than L6) you can NOT put the L6 rad in the correct place with the higher and slightly forward (lower) brackets in there

[Praxiss454]

Originally Posted by jtrichard

Yes that's a V8 upper bracket the tanks are wider...At some point in the trucks life someone has put a V8 rad in there as you can see with the lower brackets (also wider than L6) you can NOT put the L6 rad in the correct place with the higher and slightly forward (lower) brackets in there

You have a damn good eye jtrichard because I didn't even post the clearer pic of the lower brackets. The pic also shows I'd only have about 1/2" clearance between the fan and radiator if I did mount it in the lower spot.

My top bracket is differently shaped than what 65 GMC showed in his pic, as well.

[TJ's Chevy]

Originally Posted by jtrichard

Yes that's a V8 upper bracket the tanks are wider...At some point in the trucks life someone has put a V8 rad in there as you can see with the lower brackets (also wider than L6) you can NOT put the L6 rad in the correct place with the higher and slightly forward (lower) brackets in there

Actually that is a V6 radiator bracket. The v6's came with a larger harrison rad than the v8's even did. You can tell by the taller top mount. Looks like a 305 V6 may have been there originally and someone swapped out for a 6, or just special ordered a larger radiator....

[Praxiss454]

Originally Posted by TJ's Chevy

Actually that is a V6 radiator bracket. The v6's came with a larger harrison rad than the v8's even did. You can tell by the taller top mount. Looks like a 305 V6 may have been there originally and someone swapped out for a 6, or just special ordered a larger radiator....

What other signs either there be of a v6? There isn't a fender badge or evidence of one that I have noticed.

[62stepside longbox]

Originally Posted by Praxiss454

What other signs either there be of a v6? There isn't a fender badge or evidence of one that I have noticed.

On a 65 if it had a v6 the emblem would be on the hood not the fender. Let's see a picture of the vin tag, gmc's could be special ordered with an inline six from 64 and up. If the vin on the tag has an "I" at the very beginning then it is an original straight six truck

[Praxiss454]

Originally Posted by 62stepside longbox

On a 65 if it had a v6 the emblem would be on the hood not the fender. Let's see a picture of the vin tag, gmc's could be special ordered with an inline six from 64 and up. If the vin on the tag has an "I" at the very beginning then it is an original straight six truck

Yes, it does have the "I".

[Praxiss454]

So I was trying to adjust the Rochester model b carb this evening prior to setting the timing, but my service manual stumped me. It's instructions were to:

1. Disconnect spark advance at distributor
and plug opening of tube.
2. Connect tachometer at coil.
3. Connect vacuum gauge to manifold.
4. With engine running (choke wide open) adjust
idle speed screw to bring idle speed to 450-500
rpm (Pow-R-Flo in drive, manual transmission in
neutral).
5. Adjust idle mixture screw to obtain highest
steady vacuum at idle speed.

I couldn't figure out where to connect a vacuum gauge. I assume this is NOT talking about the vacuum advance line from the carb to the distributor, because at idle that should not be pulling a vacuum.

Can anyone point me to exactly where I hook up the vacuum gauge?

[creep]

Good to see another GMC getting brought back to life.

[TJ's Chevy]

Originally Posted by Praxiss454

Yes, it does have the "I".

I= Contains 6 cylinder engine(230,250,292).

10= model 1000

01= 115 inch wheelbase

Z= Manufactured at the Fremont, CA plant.

3910= was number 3910 to roll out of the plant.

A= GVW of Up to 6000 pounds.

So it is a 6 cylinder truck. Looks like someone may have special ordered a larger radiator or something else.