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Oh well then, at times on a dyno I grab the vac secondary shaft and force it open the power allways goes up so I guess DP is the way to go then. Its not really a fault of the carby but the tune of the primary barrels. I was working on a twin 4 barrel setup on a t bucket rod once and it was all wrong. The motor was all wrong etc and sometimes you could get 85 BHP at the wheels without the secondaries opening and other times you could get them to open at 35 BHP. Thats without doing anything to the carbys just driving it on the dyno and thats at the same revs and load. It was wierd. So at least a mechanical carby will give you full open power.
However a correctly setup vac will give good results for street use. DP is probably easier to do though.
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