Newbie, Buying my first. 72 GMC K20

[Moose Monkey]

You are making headway. More photos please.

[Ol Blue K20]

Originally Posted by Moose Monkey

You are making headway. More photos please.

X2.......we really need to show us more......lol

[Joseph2001]

I will get pictures tomorrow. Been doing some research the past few days, I found some things that have brought up some questions. No idea how much of the information I've found is correct, My exhaust manifolds numbered 3932465 are 69-70 specific, my Intake Manifold numbered 340266 are 73-81. And the Carb as I believe I said before is from a 1974 350. I know the block is a 350, 3970010 casting numbers are 350 69- late 70s. Im looking at motor mounts tomorrow to see about evidence of a motor change. If any of the dates ive said are incorrect please tell me.

[Joseph2001]

Oh and I have a leaking valve cover gasket and 1 bad valve cover, looks like they tightened it down to much and the tin started to curl out of shape.

[El Dorado Jim]

probably had an engine swap and those valve covers are famous for leaking, you can spend about $30.00 on a set of good rubber valve cover gaskets made by felpro,worth every penny,and they come with long metal pieces to spread the torque on the valve covers, I got mine at autozone

[Joseph2001]

Going to look on Summit racing or Jegs for valve covers. I was recommended to get the Cast Aluminum covers.

[Joseph2001]

Verdict is, she had an Engine swap, according to the Nastyz28 forums Its an L65 165hp from a smaller passenger car. It seems to me like someone built the motor with what they had lying around. 72 block, 73-81 intake, 69-70 exhaust manifolds. Im almost afraid to look at the heads lol. Found the date tag for the th350 its 72, Spid calls for Turbo Hydramatic, so I believe its original.

[El Dorado Jim]

Originally Posted by Joseph2001

Going to look on Summit racing or Jegs for valve covers. I was recommended to get the Cast Aluminum covers.

I went with cast aluminum,they are great, wont bend/warp like the sheetmetal ones and they look good, I used the expensive rubber gaskets on those as well, they are worth the investment

[Joseph2001]

My Dad said the same thing. The tins know to leak, he also said.

[bill3rail]

Originally Posted by Ol Blue K20

I'm getting dizzy and may throw up....

Ctrl-Alt-Down Arrow
will slow down the nausea.

Bill

[bill3rail]

Beautiful Truck! Enjoy it.

Bill

[Joseph2001]

Finally heres a couple pics. Phone hasn't been wanting me to upload them. Heres some interior, its actually pretty clean. And the rusted out drivers side floor, and the patch it had. Probably gonna be a little dizzy, I still don't know why they upload like that or how to fix it

[Moose Monkey]

Looks like you are off to good start.

[Joseph2001]

I pulled the radio and speaker yesterday, speaker is toast, so no music while im working, will have to continue using my phone. Finally doing a tune up this weekend, fluids,plugs & wires, filters. Some house work to do today so won't be doing much to the old girl today. Ill make sure to get more pics tomorrow when fast internet picks up and I can actually upload them. But for now here is a pic of the stickers on the back window. NRA, Green Mountain Boys Horse Association Vermont, and United States Pony Club. Seems the old girl has some history and has quite a life, If she could talk I can only imagine the stories she'd tell.

[FleetsidePaul]

I hope you're keeping the stickers. They look cool.

[Joseph2001]

The stickers are staying, they'll go well with the Johnny Cash sticker I have to put on her. She will be working truck anyways. She'll haul plenty of horse grain for my fat horses

[Joseph2001]

More pictures later today. Not sure what Ill do today, there's something I can be out there doing though. Also, I finally found a ratio tag on the front axles, 45-11 which I believe is 4.09? Would the rear be the same? I know 4.10 and 4.11 are within tolerance, so they're a possibility.

[Ol Blue K20]

Where did not you find those numbers? There should be a stamped tag on the front diff cover.

[Joseph2001]

Originally Posted by Ol Blue K20

Where did not you find those numbers? There should be a stamped tag on the front diff cover.

Alot of packed and dried mud in the way, I finally took the hose to it and cleaned it up enough.

[Joseph2001]

Pictures soon. I had taken a break from my truck, helping my brother with an 82' Ford f100 he dragged in, 300 I6 isn't running like it should, PO loved epoxy, its all over the engine compartment. His problem now! Back to the Real Truck!!

[Joseph2001]

I don't even know how to explain this mess. Its a miracle we managed to drive the truck home. None of the plug wires were in the right place, except Cylinder 1. I can't believe it, it was a mess!

[collin70k/20]

awesome truck man and great progress looking good.

[Ol Blue K20]

Originally Posted by Joseph2001

I don't even know how to explain this mess. Its a miracle we managed to drive the truck home. None of the plug wires were in the right place, except Cylinder 1. I can't believe it, it was a mess!

How's it run now? It's a bit strange if the firing order was screwed up. It should of popped and done a lot of weird stuff..

[57taskforce]

I wonder if the timing chain is stretched and some one shuffled the plug wires on the distributor one prong over to get enough adjustment to get the distributor timing right. Don't ask me how I know about this. But that wouldn't explain why #1 was in the right spot.

[Joseph2001]

It was misfiring like crazy, but we just figured dead plugs. I changed plugs and she ran better but still misfiring as bad, Dad got to looking and noticed the plug wires, We got them straightened out and she's 10x better, I don't hear a miss