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GMC V6 and V12 Engines Engine repair and rebuilding

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  #11  
Old May 11th, 2016, 05:36 PM
bigblockv6 bigblockv6 is online now
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Default Re: 305E Intake mod.

Yes it will bolt up but use the 305 intake gaskets.
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  #12  
Old May 11th, 2016, 05:38 PM
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Default Re: 305E Intake mod.

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Originally Posted by bigblockv6 View Post
Yes it will bolt up but use the 305 intake gaskets.
Good to know!
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  #13  
Old May 23rd, 2016, 05:53 AM
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Default Re: 305E Intake mod.

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Originally Posted by bigblockv6 View Post
If you got a Magnum manifold there won't be any need to do any welding, It's all about milling the top surface flat, cutting out a square bore pattern then fitting a carburetor spacer plate and drilling & tapping it. I've built two already and right now I'm building a third one, I'll post some pics.
Do you happen to have any spare magnum manifolds for sale, original or converted for Holley 2bbl use?

I wonder if it's possible to mill one of these down and convert to a 4 bbl setup? Holley Street Avenger, Rochester Quadrajet, or Carter AFB???

Last edited by Chuck78; May 23rd, 2016 at 01:37 PM.
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  #14  
Old May 23rd, 2016, 02:02 PM
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Default Re: 305E Intake mod.

Here's some pics of two 4bbl manifolds I built, one uses a spread bore adapter so Quadrajet can be used and the other just uses a square bore spacer, both manifolds were milled down and the bases were opened up. The Magnum manifold already has 4bbl plenum in it because GMC actually did offer a dealer installed 4bbl option so the 2bbl version of the manifold was just cast with a different top base4bbl manifold for GMC V6.jpg

top view V6 manifold (2).jpg

0210001539.jpg

0210001514.jpg
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  #15  
Old May 23rd, 2016, 03:30 PM
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Default Re: 305E Intake mod.

Quote:
Originally Posted by bigblockv6 View Post
Here's some pics of two 4bbl manifolds I built, one uses a spread bore adapter so Quadrajet can be used and the other just uses a square bore spacer, both manifolds were milled down and the bases were opened up. The Magnum manifold already has 4bbl plenum in it because GMC actually did offer a dealer installed 4bbl option so the 2bbl version of the manifold was just cast with a different top base
Didn't know GM offered a 4 barrel option! Anyone ever use it that your aware of? That'd be one heck of a rarity!
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1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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  #16  
Old May 24th, 2016, 01:58 PM
bigblockv6 bigblockv6 is online now
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Default Re: 305E Intake mod.

Quote:
Originally Posted by bigblockv6 View Post
Here's some pics of two 4bbl manifolds I built, one uses a spread bore adapter so Quadrajet can be used and the other just uses a square bore spacer, both manifolds were milled down and the bases were opened up. The Magnum manifold already has 4bbl plenum in it because GMC actually did offer a dealer installed 4bbl option so the 2bbl version of the manifold was just cast with a different top baseAttachment 4647

Attachment 4648

Attachment 4649

Attachment 4650
I don't have any extra manifolds.
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  #17  
Old May 25th, 2016, 02:25 AM
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Default Re: 305E Intake mod.

Well it's all bolted up and the motor is running like a Champ! Drinks the gas with No issues and pulls darn well. Really happy with how it turned out. Super easy to start compared to before to.
Attached Images
File Type: jpg 007.JPG (1.72 MB, Multiple views, 23 clicks)
File Type: jpg 008.JPG (1.91 MB, Multiple views, 12 clicks)
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1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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  #18  
Old May 25th, 2016, 06:35 AM
bigblockv6 bigblockv6 is online now
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Default Re: 305E Intake mod.

Quote:
Originally Posted by TJ's GMC View Post
Didn't know GM offered a 4 barrel option! Anyone ever use it that your aware of? That'd be one heck of a rarity!
There was a wrecking yard in Southern California that specialized in GMC V6's and they had 1 factory 4bbl manifold for sale back around 15 years ago, unfortunately the wrecking yard caught on fire and is gone. There was also a 66 pickup with a 351E running around Santa Rosa California just next to the town I live in ,hat had a factory 4bbl intake. Not many are out there because hardly anyone knew about the option, GMC should have publicized on that more. Most engine overhaul gasket sets would come with the 4bbl base gasket and air cleaner gaskets for Magnum V6 engines.
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  #19  
Old May 25th, 2016, 02:32 PM
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Default Re: 305E Intake mod.

Quote:
Originally Posted by bigblockv6 View Post
There was a wrecking yard in Southern California that specialized in GMC V6's and they had 1 factory 4bbl manifold for sale back around 15 years ago, unfortunately the wrecking yard caught on fire and is gone. There was also a 66 pickup with a 351E running around Santa Rosa California just next to the town I live in ,hat had a factory 4bbl intake. Not many are out there because hardly anyone knew about the option, GMC should have publicized on that more. Most engine overhaul gasket sets would come with the 4bbl base gasket and air cleaner gaskets for Magnum V6 engines.
Now that is neat. Hopefully one of these days I'll run across one. Be a Neat option to have.
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1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
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  #20  
Old May 25th, 2016, 04:19 PM
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Default Re: 305E Intake mod.

Quote:
Originally Posted by TJ's GMC View Post
Well it's all bolted up and the motor is running like a Champ! Drinks the gas with No issues and pulls darn well. Really happy with how it turned out. Super easy to start compared to before to.
Wow, that looks fantastic! I want to do that now! Great work!
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