The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > All 4x4 Tech & Off Roading

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 03-15-2017, 11:49 AM   #1
BILT4ME
Registered User
 
Join Date: Jul 2016
Location: Olathe, KS
Posts: 177
Correct Factory Exhaust Manifolds 70 GMC K2500

I am looking for the CORRECT part numbers for both exhaust manifolds for a 1970 GMC K2500 3/4T 4x4, with a 350 and 4sp.

Both manifolds that are on this truck are broken and I am quite sure they have been replaced multiple times due to the VERY poor care that was taken of it. It was used in a construction business and was flat-out abused.

I am looking to start out as if I am going to restore to correct factory specification, then my wallet will help me decide from there.

I have searched this forum as well as many others and I cannot seem to locate the correct literature that I KNOW is out there.

I am looking for the CORRECT casting numbers for both left and right.

The CURRENT ones I have are:
3747038 (Left)
3932465 (right)

I believe the right one to be correct, but not the left one. Please help.
__________________
1970 GMC K2500
Dis-use is harder on a car than mis-use.
BILT4ME is offline   Reply With Quote
Old 03-17-2017, 08:24 PM   #2
Ol Blue K20
Senior Member
 
Ol Blue K20's Avatar
 
Join Date: Nov 2012
Location: Fairfield, CA
Posts: 5,639
Re: Correct Factory Exhaust Manifolds 70 GMC K2500

I'm not sure on the part numbers but Dormin remakes them. They're ramhorns with straight dumps.
__________________
"Some Days Chickens And Some Days Feathers"

Dale
Ol Blue K20 is offline   Reply With Quote
Old 03-17-2017, 11:58 PM   #3
El Dorado Jim
Registered User
 
Join Date: Dec 2009
Location: El Dorado Ca
Posts: 1,338
Re: Correct Factory Exhaust Manifolds 70 GMC K2500

sub'd
El Dorado Jim is online now   Reply With Quote
Old 03-20-2017, 01:17 PM   #4
BILT4ME
Registered User
 
Join Date: Jul 2016
Location: Olathe, KS
Posts: 177
Re: Correct Factory Exhaust Manifolds 70 GMC K2500

Quote:
Originally Posted by Ol Blue K20 View Post
I'm not sure on the part numbers but Dormin remakes them. They're ramhorns with straight dumps.
Yes, but the Dorman quality has suffered severely in the last few years. The ID of the standard ones are smaller ID and they ALL include the A.I.R. ports and I don't want that.

I am looking to install CORRECT manifolds for this truck, with the exception that I am eliminating the heat riser on the bottom of the manifold. I do not know which side originally had the the heat riser, as the truck that we have has been cobbled so much, I am not sure what is correct and what is not.

I want to be able to make this a pseudo-restoration, as we have most all matching numbers for the main parts and the under-hood paint is still original and the cab/front is in decent shape.

We'll start there, then performance modify later.

Thanks!
__________________
1970 GMC K2500
Dis-use is harder on a car than mis-use.
BILT4ME is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 02:33 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com