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Gregory,
I have not done any serius part throttle work on the dyno of late but back a half dozen years or so I was looking at carbs and fuel consumption for street V8's. I was doing this sort of as a side project so the results ar far from definitive. However, here's what I found with the limited testing I did. Holley's Spread Bore carbs when jetted for ecomomy on the primary did very well. # 1 (remember this is not the be all and end all of tests in this area) of the carbs I tested was a Quadra-jet built by the Carb Shop in California. It had an external part throttle mixture adjusting screw which allowed the leaning of the mixture untill best results were seen. I really liked that carb - maybe I should build an econo motor using one. Last but hardley least, and real close to the Q-jet, was a Carter Thermo-Quad. That's now the Edelbrock carb, and some testing we have done of late indicates this could be a good choice for reasonable performance and good economy. As for regular square bore Holley and BG carbs I have done little in the way of fuel economy testing. That said I do believe that more time spent looking at part throttle stuff instead of fixating on big Tq & hp #'s with these carbs would reveal that they can do a pretty good job in both camps. Then there is the Kendig carb - those guys have somthing there but don't listen to advice (or at least they didn't).
DV
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