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Reply to "Carburetors with Annular Boosters"

A lot of hot rod types think of annular boosters as things that improve low rpm response for engines with big carbs that are operated on the street. And its true they do serve that purpose. And from that narrow perspective they wouldn't be of benefit in your application because the Avenger isn't "too big" to begin with. In fact, putting annular boosters in a 680 carb doesn't make sense from that perspective.

Autolite installed annular boosters in their 4100 series carburetors of the 1960s. Ford enthusiasts love those carburetors to this day, they performed well and were very reliable. They were not large carburetors, they didn't need annular boosters because of the carburetors' size. But Autolite engineers chose annular boosters for the 4100 series carburetors for other reasons (based upon good engineering) such as throttle response, fuel economy, low rpm and part throttle performance. My point is there are other distinct advantages for street engines (or any engine for that matter) to be equipped with annular boosters. And if I loose a little flow with a 680 carb, no big deal with an engine rev limited at 6200 rpm. If I want to rev the engine higher, I'll use the bigger 780 carb.

What I don't see is the advantage of making a 670 carb flow 730, especially when I could go out and buy 730 to begin with. That king has no clothes … not for me. I'd rather have a carb with a functional choke for my street engine. Mr. Oliver and I have different perspectives.

I think these particular QFT carbs with annular boosters will make good replacements for the discontinued Demon carbs, the best "street carbs" you can purchase. That's why I'm pleased with the reply I received.
Last edited by George P
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