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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old June 13th, 2017, 02:56 PM
1972RedNeck 1972RedNeck is online now
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Default 4bbl Intake Pics Please

Anybody have any detailed pictures of their 4bbl intake manifolds (TJ's GMC?) Did you just hog out the top of the intake and bolt/epoxy an aluminum 4 barrel spacer to the top of it for extra clearance and a true mating surface?

I would appreciate a little info as I have a 351E intake manifold that I would like to start tinkering on in my spare time...
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  #2  
Old June 13th, 2017, 04:07 PM
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Default Re: 4bbl Intake Pics Please

I milled mine.....pictures are not super detailed, but best I have.

Mill the top surface of the manifold Flat. Then either purchase a spacer with 4 bolt holes or make one. I bought a 1 inch thick block of aluminum and made mine.

Then drilled 4 mounting holes and used bolts and nuts. Permatexed the nuts on the bolts. I used two thick gaskets and a thin bead of silicon to aid in sealing. No issues yet.
Attached Images
File Type: jpg 001 (3).JPG (2.24 MB, Multiple views, 8 clicks)
File Type: jpg 001 (2).JPG (1.57 MB, Multiple views, 9 clicks)
File Type: jpg 003.JPG (1.92 MB, Multiple views, 7 clicks)
File Type: jpg 002 (2).JPG (1.84 MB, Multiple views, 5 clicks)
File Type: jpg 004.JPG (1.81 MB, Multiple views, 6 clicks)
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Old June 13th, 2017, 04:12 PM
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Default Re: 4bbl Intake Pics Please

One thing I'm thinking I should have done was make that spacer with two ovals and an air gap like the manifold instead of open plenum. I may do that eventually when I convert to a smaller 4 barrel.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

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Old June 14th, 2017, 01:56 AM
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Default Re: 4bbl Intake Pics Please

Quote:
Originally Posted by 1972RedNeck View Post
Anybody have any detailed pictures of their 4bbl intake manifolds? Did you just hog out the top of the intake and bolt/epoxy an aluminum 4 barrel spacer to the top of it for extra clearance and a true mating surface?
Here's the manifold I put on my 401. I drew the adapter I wanted, and had a machinist friend mill it for me. He milled the top of the manifold flat for me too.
Attached Images
File Type: jpg Machined Magnum Manifold.jpg (275.0 KB, Multiple views, 5 clicks)
File Type: jpg Manifold with 4 Barrel Adapter.jpg (267.1 KB, Multiple views, 6 clicks)
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Old June 14th, 2017, 02:11 AM
bigblockv6 bigblockv6 is online now
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Default Re: 4bbl Intake Pics Please

1972Redkneck, here's a couple that I built that were machined perfectly flat so all I used was gaskets to bolt on a spread bore to square bore adapter, drilled mounting holes and the other manifold which was latest I built I just used a square bore spacer that I drilled out and mounted with a gasket as well, this one to me is a much better example over how it should be done versus the first one I did.
Attached Images
File Type: jpg 0210001514.jpg (45.3 KB, Multiple views, 4 clicks)
File Type: jpg top view V6 manifold.jpg (417.0 KB, Multiple views, 3 clicks)
File Type: jpg 4bbl manifold for GMC V6.jpg (414.8 KB, Multiple views, 3 clicks)
File Type: jpg 0210001539.jpg (53.1 KB, Multiple views, 5 clicks)
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  #6  
Old June 14th, 2017, 06:09 AM
BobBray BobBray is online now
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Default Re: 4bbl Intake Pics Please

Did anyone ever find any information about the Edelbrock GMC V6 manifold?

Back in the 40's-50's time frame, there was a company in Los Angeles by the name of Ellis Manifolds. They specialized in multi-carb. intake manifolds for large trucks. Unfortunately they seem to have gone out of business before the GMC V6 became popular.
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Old June 14th, 2017, 06:29 AM
bigblockv6 bigblockv6 is online now
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Default Re: 4bbl Intake Pics Please

Bob, was the Edelbrock manifold a 4bbl version for the V6?
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  #8  
Old June 14th, 2017, 08:26 AM
BobBray BobBray is online now
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Default Re: 4bbl Intake Pics Please

Quote:
Originally Posted by bigblockv6 View Post
Bob, was the Edelbrock manifold a 4bbl version for the V6?
Not really sure. Story goes Hot Rod did a story on 6 cylinder engine performance sometime in the early 60's, and there was a picture of a GMC V6 with an aftermarket intake on it. I have never been able to find the issue or anything about the manifold. I believe it was mentioned around here some years ago.
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  #9  
Old June 14th, 2017, 02:18 PM
bigblockv6 bigblockv6 is online now
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Default Re: 4bbl Intake Pics Please

I do remember vaguely that being talked about quite a few years back on Jolly's site.
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