AFB is the name for the Carter Aluminum Four Barrel carburetors common in the early/mid 60s.
Later Carter introduced a refined series with spring balanced air valve secondary venturis. These were somewhat larger and called AVS carburetors. They were very common on Chrysler HP engines. Both GM and Ford built their own carburetors and did not use the AVS series.
The secondary air valve in the AFB series carburetors were balanced by counterweight, making readjustment difficult.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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