![]() The progressive side does not open until the primary is around 1/3 open. What that means is the primary throttle plate is 32mm in diameter, and the secondary side is 36mm. This carburetor is a “32/36” Progressive design. We do NOT have a conversion kit for these chokes! But if you pull one off of a Pinto or another car in the junkyard, you may have the DFAV version, which has 2 water hoses that run to the choke assembly. Because our cars are aircooled, we never ever deal with the DFAV. ![]() Put simply, the “A” is just a water choke version, and the “E” is the electric choke version. The DFAV and DFEV are the same basic carburetors, BUT the “A” stands for “Aqua”, or water. We suggest that you get a Genuine Weber Progressive DFAV/DFEV Carburetor. If you have an EMPI progressive, understand that is a Chinese copy of a Weber DFAV/DFEV. Hopefully this article will help some folks, who really have no idea what they are doing, to get their progressive running well. Here at ACN we have gotten enough tech questions asking about the Weber Progressive Carburetor that we felt it was time to get a good article up on the subject.
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