Carb Adapter

[bucket]

Edelbrock 2732 Edelbrock Carburetor Adapters | Summit Racing

Free Shipping - Edelbrock Carburetor Adapters with qualifying orders of $109. Shop Carburetor Adapters at Summit Racing.

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I have used many of these to put a Holley/Edelbrock on a spread bore performer intake on my big block Dodge motors. Some say they are better on aluminum intakes but for what they cost it may be worth a try. A 1/2 phenolic or wood spacer on top of it may help with fuel percolation.

Those will only work on an aftermarket intake with a divided plenum. You can also stack 2 or 3 of them, with a gasket between each, to act as a heat insulator.

 

[bucket]

Here's what I'm talking about with the 4-hole style adapter. As the primaries open up, one half of the butterfly basically feeds air straight into an aluminum wall. Once you hit around 75% throttle, it doesn't look to be too much of a restriction. But in the area where a vehicle is regularly driven (by the average person), that adapter really gets in the way of the airflow on one side of the butterfly. Maybe in the real world, it doesn't actually hurt anything on a stock engine. I don't know, I've never used the 4-hole type before.

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[Sad Sack]

If you have deep pockets, spend the $$$ get the Holley spread bore replacement. They are pricey but direct bolt-ons. Your year would have used the List 6210 model, you'd have to research current offerings.

Current offering:​

Holley 4175 650 CFM 4-Barrel Carburetor 0-80555S​

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[Mlcdc1]

Thanks - interesting conversation/info

 

[ali_c20]

The AVS 2 is spread bore but advertised as square bore. The difference in bore is not as big as on the Quadrajets but I bolted mine directly to the sread bore manifold of my K5 with a 1/4" gasket.

https://www.summitracing.com/parts/edl-1906

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[Mlcdc1]

Interesting - any issues with getting it tuned/dialed in?

 

[Ricko1966]

Gave up on tuning the quadrajet and bought an Edelbrock 1906 for my 1977 C15 with 350 engine. Looks like there are a couple of options available for the adapter to fit it to my stock spreadbore intake. Any recommendations or opinions?

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I totally missed the 1906 part just saw Edelbrock and adapter and stated my opinion Good catch by @ali_c20 1920 will bolt to spreadbore no adapter required. Whenever I see Edelbrock and carbureator I always think of the standard performer carb.

 

[Turbo4whl]

Your year would have used the List 6210 model

Double pumper, mechanical secondaries. Plenty of go but poorer fuel economy. Better choice is a Holley 9895. Vacuum secondaries, an electric choke. Very tune-able, and still available new. The 6210 and 9895 are both, 650 CFM. New they are a lot of money now. You can find them at swap meets as Holley built and sold lots of these direct fit carbs.

 

[ali_c20]

Interesting - any issues with getting it tuned/dialed in?

Nope, bought the tuning kit with springs, needles and jets. First put in the springs matching the engine vacuum and from that jet and needles.
I run the 500cfm version on my 350, throttle response is great, like a monkey on speed.

Before you tune your carb make sure your ignition is set right and check your spark plugs and wires if they need to be replaced.