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I removed all three carburetors from my 70 Plymouth Six-Pack for refurbishing. All went well, I put the front and center carburetors back on, no problems at all. I can't get the back carburetor to work, it starts binding as soon as I tighten the bolts down. Both the manifold and carburetor...

What is the correct accelerator pump diaphragm to use on a 440 six pack? My '70 Plymouth GTX with the 440 six pack runs well, but i get a slight hesitation when hitting the gas pedal while running at speed. If I'm in 4th gear (or any gear) running along at any speed and I hit the gas I get a...

Has anyone had any experience with this company? They have a three two barrel setup that they say should bolt on to my six-pack manifold and provide 'out of the box' performance.

How do I tell a back carburetor from a front one? Let's suppose I'm at a swap meet and a vendor has an end carburetor for sale... How do I tell of it's a front or back? Is there an easy to identify a front one vs a back one?

Can anyone suggest a manifold gasket for a 440 six pack with the factory intake manifold? I would rather not block off the heat riser crossover, I would prefer a faster warm up for driveability on the street.

Are the front and back carburetors in a 440 six pack the same? Can they be swapped/interchanged from front to back?

A fellow club member who is more knowledgable than I says the '71 440 six pack carburetors have a some improvements over the '69-70 ones. What improvements were made for the '71 440 six pack carburetors? Is a set of '71 carburetors considered more desirable than a '69-70 set?

What are the correct bolts to fasten the carburetors to the intake on a '70 440 Six Pack? A fellow club member says the correct carburetor to intake bolts have an 'H' on the head, and that these same style 'H' bolts fasten the intake manifold to the heads with washers. (I was thinking that...

I have a '70 Plymouth with the 440/6. The fast idle is about 2200-2300 RPM and that's too fast. How do I slow the fast idle speed? The manual says to bend the tang on the center carburetor choke. In which direction do I bend it and how do I bend it? Also, what can be done to get the car to...

I have a '70 Plymouth 440 six pack. The end/outboard carbs are off the car. I put a vacuum pump on the inlet hose of each carburetor and pumped up to about 15 - 16 psi. The throttle plates open slightly and then it loses vacuum and they close back shut. (The vacuum pump and connecting hose...

I have a '70 Plymouth with a factory 440 six pack. The vacuum hose to the distributor comes from the center carburetor. There is NO vacuum in that hose, no matter the speed of the engine. I never get vacuum at idle, acceleration, or running at higher RPM. Had the carbs rebuilt by National...