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1950 Plymouth Special DeLuxe 2 door sedan. Set the point gap and timing. Vacuum advance unit works (disconnected while timing was set). Stumbles when accelerator is depressed. Suspect bad/worn accelerator pump. Did not want to take carb apart without rebuild kit in hand. Problem is that I am having difficulty finding D6H3. I can find D6H1 and D6H2 but not the 3. Is it the same as the 2 or is it unique?

I am getting to the point where I may be putting the '40 wagon on the road soon, and ran across this post from Nov 2012 on the HAMB. I had never heard of Plymouth substituting the Chevy W1 Carter in 1947. The poster, Jon "carbking", seems pretty knowledgable on the subject. Can anyone validate his claims? He said Plymouth called it the Carter 574. ----------------------------------------------------------------------------------- "Since you have already decided to put on a two-barrel, the following may be moot; but you may find it interesting. The really easy and inexpensive way to dramatically improve both power and economy on those old Plymouth 218's is to simply bolt on a Carter W-1 built for Chevrolet. Plymouth actually did this in 1947 when the plant producing the BBR carb went on strike. The Chevrolet carb with no other changes is good for 5~10 percent increase in horsepower, and 20~30 percent increase in fuel economy. The W-1 used as factory equipment by Plymouth was the Carter 574s. During this time period, Carter offered 3 different levels of one-barrel carburetor: (A) BBR series - cheap, worked, but never worked well ( W series - inbetween price, worked excellent, but manual choke and power circuit © WA series - most expensive, worked a tiny bit better than the W, with auto choke and vacuum power circuit Of course, simply bolting on a different one-barrel is not as "cool" as putting on duals, but if no other mods are made to the engine; it would probably function better. Jon."