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Well, now, that's INTERESTING! Have been going by the soot on plugs/exhaust pipes. My engine has hardened seats so I haven't ever put any of the faux lead additives in my gas tank. (Never put any ethanol in my car either!) If my carb is tuned okay and I used one of those additives, would I...

Talkwrench, Good to hear that the smaller carb didn't make much difference, although I probably should have gotten a 500 cfm instead of a 600 cfm but I'd like to make what I have work. My car runs rich, not lean, which is why I'm considering downsizing the jets. Haven't been able to tune the...

The 4100 was rebuilt by Pony Carb, has less than 500 miles on it. Pony Carb is gone and the 4100 is now retired. If Pony Carb were still around, I would send it out to them but alas . . .

Thanks! I would like to work with what I have. I just took a defective autolite 4100 off the car, readjusted the timing, and she's SO much peppier now than before--now, I see how they were used for drag racing back in the day! I try to keep her stock but I'm thinking a little modern tech...

I'm using a '57 distributor.

I put a modern 600 cfm 4 barrel carb (secondary type = vacuum) that will take Holley jets on my 272. (I have a '57 intake manifold on my car.) My car is running great but suspect fuel mix is too rich. Will run the car for a couple of weeks and then check the plugs. Put in new plugs while I was...