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Old 06-24-2017, 09:24 PM   #126
Moose Monkey
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Re: Newbie, Buying my first. 72 GMC K20

You are making headway. More photos please.
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Old 06-24-2017, 09:35 PM   #127
Ol Blue K20
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Re: Newbie, Buying my first. 72 GMC K20

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You are making headway. More photos please.
X2.......we really need to show us more......lol
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Old 06-25-2017, 09:33 PM   #128
Joseph2001
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Re: Newbie, Buying my first. 72 GMC K20

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.
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Old 06-25-2017, 09:36 PM   #129
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Re: Newbie, Buying my first. 72 GMC K20

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.
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Old 06-25-2017, 10:50 PM   #130
El Dorado Jim
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Re: Newbie, Buying my first. 72 GMC K20

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
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Old Yesterday, 08:12 AM   #131
Joseph2001
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Re: Newbie, Buying my first. 72 GMC K20

Going to look on Summit racing or Jegs for valve covers. I was recommended to get the Cast Aluminum covers.
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Old Yesterday, 05:05 PM   #132
Joseph2001
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Re: Newbie, Buying my first. 72 GMC K20

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.
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Old Yesterday, 11:13 PM   #133
El Dorado Jim
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Re: Newbie, Buying my first. 72 GMC K20

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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
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