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GMC V6 and V12 Engines Engine repair and rebuilding

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  #11  
Old December 24th, 2021, 08:32 PM
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Default Re: Holley Carburetor Conversion

Is there any reason why people don't use an electric/automatic choke with these engines?
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  #12  
Old December 24th, 2021, 10:49 PM
BobBray BobBray is offline
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Default Re: Holley Carburetor Conversion

Quote:
Originally Posted by AngryPirate View Post
Is there any reason why people don't use an electric/automatic choke with these engines?
No specific reason why you couldn't use an electric choke. These engines always had a manual choke, as does the popular 350 and 500 cfm Holley 2300 series 2bbl. carburetors do, Knob is already in the dash, so that's why I went with a manual choke.
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  #13  
Old December 24th, 2021, 11:36 PM
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Default Re: Holley Carburetor Conversion

Quote:
Originally Posted by BobBray View Post
No specific reason why you couldn't use an electric choke. These engines always had a manual choke, as does the popular 350 and 500 cfm Holley 2300 series 2bbl. carburetors do, Knob is already in the dash, so that's why I went with a manual choke.
Good to know. Thanks for the response.
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  #14  
Old December 25th, 2021, 07:28 AM
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Default Re: Holley Carburetor Conversion

Quote:
Originally Posted by BobBray View Post
No specific reason why you couldn't use an electric choke. These engines always had a manual choke, as does the popular 350 and 500 cfm Holley 2300 series 2bbl. carburetors do, Knob is already in the dash, so that's why I went with a manual choke.
The Edelbrock 1406 on my 401M has an electric choke. It works well.
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  #15  
Old December 25th, 2021, 02:22 PM
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Default Re: Holley Carburetor Conversion

Brian,

I too have made the swap to the 2-barrel set up. My carb is a Holley 4412 model. I found a dual intake and installed that using the Mr. Gasket adaptor as stated above. I used the Mr. Gasket air filter designed to fit the Holley $20.00, I cabinet blasted and painted it under hood black.

The other issues I ran into was the accelerator bell crank throttle hookup. The carb is wider, and the alignment is thrown off. So, I simply made a new linkage. (See pics).

I recently changed transmission and went with a wire cable throttle set up.

I also wanted the look of an oil bath type air cleaner, so i used the base from the new Mr. Gasket breather as the foundation (fits the top of the Holley) and I set an oil bath cleaner on top (after I removed all the steel wool and cut the guts out) I used a correct sized diameter dry air filter for the inside.)
Attached Images
File Type: jpg 2430536160054402330SymxwJ_ph.jpg (44.7 KB, Multiple views, 10 clicks)
File Type: jpg 2768940040054402330IttKsM_fs.jpg (580.4 KB, Multiple views, 8 clicks)
File Type: jpg Breather.jpg (105.0 KB, Multiple views, 8 clicks)
File Type: jpg Linkage showing OEM accelerator bell bracket.jpg (123.1 KB, Multiple views, 8 clicks)
File Type: jpg 305 V-6.JPG (69.1 KB, Multiple views, 9 clicks)
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  #16  
Old January 1st, 2022, 09:03 PM
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Default Re: Holley Carburetor Conversion

Quote:
Originally Posted by AngryPirate View Post
Is there any reason why people don't use an electric/automatic choke with these engines?
I installed an electric choke on mine. Never did like the manual choke, wife always leaving it on when she drive. Then complain it not running right.
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  #17  
Old November 18th, 2022, 07:50 PM
Jupiterssun Jupiterssun is offline
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Smile Re: Holley Carburetor Conversion

So i bought me a Dump Truck with a v6 401. And it already has the conversion. But as i search for gaskets i realize is that there is 2 types of intakes. The number you all show is for a square bolt on adapter. Mine is not. My intake is 3 3/16 on top and 4 1/2 bottom probably not exact but you get my point. I'm looking for a thick gasket carb to intake. It had one when i pulled it. And this motor ran awesome. Don't want to change what works. Appreciate all your links. Thank you. O and the question of how many quarts for a 8 quart motor is 7.5 better short short then over filled.😁
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  #18  
Old November 18th, 2022, 08:36 PM
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Default Re: Holley Carburetor Conversion

Welcome to the forum Jupiterssun!

It would be neat to see some pics of the Dump Truck.

Mike's Carburetors page and it's the base gasket for a Magnum Intake.

https://www.carburetor-parts.com/Str...49_p_4737.html
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Last edited by Funky61; November 19th, 2022 at 01:46 AM.
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  #19  
Old November 19th, 2022, 02:35 PM
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Default Re: Holley Carburetor Conversion

Brian,

Have you given any thought to the accelerator linkage? When I did my conversion, the '60 305 had the multi-piece bell linkage, I have to make my own connector rod out of a piece of flay 1/8" think aluminum. It was easy to make and bend in the offset. (see pictures). They may have made something for this, but at the time I could not find anything. Hope this help.
Attached Images
File Type: jpg 2586068060054402330wFmagC_ph_zps0cc202ca.jpg (40.3 KB, Multiple views, 2 clicks)
File Type: jpg Belllinkage_zps8862b4bf.jpg (44.7 KB, Multiple views, 2 clicks)
File Type: jpg Linkage showing OEM accelerator bell bracket.jpg (123.1 KB, Multiple views, 3 clicks)
File Type: jpg Carb Driver side.jpg (4.91 MB, Multiple views, 2 clicks)
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  #20  
Old November 19th, 2022, 02:43 PM
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Default Re: Holley Carburetor Conversion

Brain,

This is my airbreather modification, I want a more OEM look so I found an older oil filled breather and modified it to take a dry element. I used the base of the Mr. Gasket 14" cheap airbreather and cut it to fit the bottom of my older breather
Attached Images
File Type: jpg 116808963_10217396945822195_8877115511718453346_n.jpg (67.8 KB, Multiple views, 5 clicks)
File Type: jpg 116641521_10217396944982174_4383979245139782692_n.jpg (89.0 KB, Multiple views, 2 clicks)
File Type: jpg 116639403_10217396945302182_6344389841176742776_n.jpg (71.4 KB, Multiple views, 7 clicks)
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