Thread: 57 Plymouth

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It never fails, a couple of days after I got the 625 CFM Swap Meet carburetors rebuilt I found out a friend of mine had the carb that was a mate for an early 60s Cadillac carb I had on the shelf. His was sitting gathering dust so we ended up doing a bit of trading and it ended up in my shop.

The Cadillac carbs are 575 CFM and I'd used a pair of them on my 65 Chevy years ago. They ran really well with the 350/4 speed in the Chevy and they had really been my first choice for the Hemi. I had the one and had been keeping an eye out for a mate for the last few years but had pretty much given up finding another.


Cad AF by M Patterson, on Flickr


I picked up a couple of kits and got them both taken apart and cleaned up. It looked like both had had a kit some time in their past but It had been a long time ago. When was the last time you took a carburetor apart and it had steel needles (no “rubber” tips) in it?

SN by M Patterson, on Flickr

They both cleaned up nice, so I now have 2 pairs of carbs to try out.


Cad AFB 2 by M Patterson, on Flickr

These AFBs are a little unusual compared to most of the ones produced. They don’t have an idle speed adjustment screw. The throttle plates are closed at idle and the speed is adjusted with the brass air bleed screw located between the fuel mixture screws. As they are the early AFBs they have the also have the smaller 4 7/32” air cleaner base instead of the 5 1/8” used on the later AFBs. I found an outfit that sells aluminum adapter rings for the air cleaners so I sprung for a pair of those too.

C2 by M Patterson, on Flickr


I figure I'll eventually try both pair of carbs on the 57 I'm kind of curious to see how much difference there will be between them.



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