Hot Rods Carbs on a nailhead

Hi guys, Freshly rebuilt 401 bored 30 over, stock cam, running a cast iron dual 4 intake, in a model A roadster pickup. ( 200R4.trans / nine inch rear)

looking for carb suggestions, I am leaning towards a pair of 650cfm Edelbrock thunder carbs but open to suggestions ? Is 2 x 650 cfm too much ? / too little ?

what ya running on yours ?

thanks all

 

Check out Russ Martin's website, Centervilleautorepair.com. I am building a similar 401 with a TA-25 cam and am using a single 800 CFM. He says go big with Nailheads.

 

Friend o mine is running this deuce nailhead with 6 Holleys. It's a fairly new build. I'll see him soon, ask how it's going.

 

Not certain what you might have available in your location, but if you can find them, a pair of ORIGINAL Carter AFB carbs (not the scarce 2x4 carbs) for single carb 401's would be MUCH easier to calibrate than the imitations, and cheaper in the long run. Just use 2 of the same number (3665s are fairly common in the US).

Jon.

 

With Progressive linkage, no problem. Love it when the second carburetor opens up. A couple of 650s sounds about right, but how about maybe rebuilding a couple of original AFB's?

 

Great minds think alike LOL.

 

You will never be sorry and if you painted the engine the stock green, the Buick rocker covers and had a wildcat factory air cleaner to me it would be perfect.

 

This works for me.
1965 Riviera Gran Sport 425... all original.
Except air cleaner!!

 

I'm running an edelbrock 750 on my 425.
No problems and easy to tune. Good on gas also.
I chose this set up over multiple carbs.

 

I believe that if your running duel quads that for most street applications two 500 cfm carbs will be fine...Most of the old setups were in that ballpark....

 

Dual 500s, max.

Bigger is not better. You will lose low-end torque and throttle response.