Multiple Carb Conversion

[ggdad1951]

I'm bummed I won't get to see this work of art in person 

[Jim Shepard]

I had to cut and extend the gas pedal rod in order to line up with the new manifold. The push rod (?) that is between the pedal rod and the swivel on the manifold wouldn’t clear the back of the manifold, which is about 3.5” further away from the block than the factory manifold. I’m not sure of the terminology I’m using so I hope you guys can follow. Anyway, maybe a photo will clarify it.

[Jim Shepard]

I extended the rod by cutting it and slipping a tube over the ends and welding it.

Edited February 3 by Jim Shepard

[Jim Shepard]

Ok, I think I’ve got the linkage dialed in. Just had the drill one additional hole in the middle arm. Otherwise, the George Asch linkage kit works great. With the cold, wet weather I decided to powder coat the manifold. That ended up delaying me an additional week or so.

[Jim Shepard]

I welded a bracket on the log to imitate the boss on the factory manifold. It seems to line up correctly but I’ll know for sure when I get it back on the motor.

Edited February 22 by Jim Shepard

[bkahler]

Looking really good!

 

[Jim Shepard]

Almost there. Just need to tweak the gas pedal linkage a little more. Looking at March 5th for initial start up date. That gives the month of March to deal with last minute problems before the BBQ.

[Jim Shepard]

Ok, got the gas pedal linkage dialed in and did a fuel pressure check. Some initial small leaking at two of the float bowl tops and two inlet fittings. That was at 3.5 lbs. of pressure at the regulator. They tightened up nicely and stopped. We’re ready for initial start up on the 5th. More later…

[LazyK]

The 5th? That's torture

 

It's past the 5th.

we're (not) patiently waiting

Edited March 8 by LazyK
Additional info

[TheGageinator]

Wow, excellent work!! I'd love to know what jet numbers you are planning to run, and if you modified anything else inside the carbs. 

[Jim Shepard]

On 3/20/2025 at 5:19 PM, TheGageinator said:

Wow, excellent work!! I'd love to know what jet numbers you are planning to run, and if you modified anything else inside the carbs. 

I had 18 complete Carter B&B’s to work with. Sounds like a lot but when you’re trying to match three it isn’t really enough. I finally settled on the only three that matched. They are E7T2’s which, as far as I can determine (and according to Tim Kingsbury), came originally on the 1950 through 1956 one and one-half to three ton trucks. This number, as you probably know, is stamped into the “ridge back” of the air horn. This designation apparently is only there to identify the original application - and provides a part number when ordering rebuild kits - it tells nothing about the internals. The other number is cast on the horn itself. In my case it’s 636. The middle section, or float bowl part, is 0-660. Finally, the bottom section or throttle body is 1-638. These parts represent the smallest sizes I could assemble based on what I had three of. The same goes for the jetting, which are the following: the pump jet is 48-75; main jet is 224-13s; step up jet is 149-56s; idle orifice tube is 123-31s. No modifications were done to the carbs.

Edited Tuesday at 11:46 PM by Jim Shepard

[Jim Shepard]

Update: waiting for another carburetor base plate/linkage bracket from George. His initial kit did not include one for the middle carb and what I discovered is that there is too much flex in the linkage without it. So much so that I could not get the carbs adjusted or synchronized. It’s going to be tight as to whether I will get this done by the BBQ. I don’t get back from Indiana until April 1st…