Help with Autolite 2100 carb!

300cfm is definitely not letting the 351w breathe to it's fullest. As far as setting up the carb, on the driver's side of the carburetor, where the throttle linkage hooks up there is a screw which will control your idle speed. If you have an auto, idle speed should be around 600-700 rpms. On the passenger side of the carb, there is a cam and screw which controls your fast idle. Adjust the screw when the car is cold so fast idle is around 1100-1200 rpm. Finally, you need to adjust the air/fuel mix. On the front of the carb, there are two round posts with flathead screwdriver slots on them. These come out of the carb angled about 45* towards the side of the car. Screw these all the way in, then back them out about 2.5 turns and use that as a starting point. Adjust both of them the same amount and direction until you get a nice clean idle.

Hope this helps,
--Jason

I could get you the specs but my book is not here...on thursday night I will post them if you haven't already got them.

hope this helps
--Jason

Skymarshal said:

I'll probably upgrade to Holley's 2300 2-bbl carb eventually. This engine's volumetric efficiency is around 575 CFM, so 500 should be sufficient for a street cruiser

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Where'd you get that info? The carb companies formula? That formula only tells you the MINIMUM size carb your motor needs. That 351 will be happier with something in the 650 cfm range.