From my experience with the AFB carbs is they seem to make about the same amount of power as a similar Holley but to be fair I've always tested them on a fairly mild engine. I did some carb testing on my 460 that I built for my '79 Ford pickup. One evening just for fun we tried a Holley 750vacuum, the stock Ford Holley off of the truck, a Carter AFB and a Carter Competition Series Thermoquad.
On my dyno the Thermoquad made the best horsepower and the stock Ford Holley made the best torque but the difference in the numbers between all of the carbs, best to worst was no more than 4 horsepower and about 4 lbs/ft torque.
I really wish Edelbrock would start making the Thermoquad again. The one I've got is an EXCELLENT running carburetor on any engine I've ever tried it. In fact, in one test it beat a supposedly well built Holley(actually a very poorly modified piece) by over 15 horsepower much to the suprise of it's owner. All that money only to get beaten by a plastic carburetor...
This message has been edited by DaveMcLain from IP address 64.251.140.163 on Nov 14, 2005 2:14 PM
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