Holley Carb Gures, Secondary adjustment!!

340doc said

I have a question about a Holley 750 DP. The secondary's have a small adj screw that sets the at rest open amount. The carb I have on the bench, the secondary's are set what seems to be open quite a bit. If I shine a flashlight down the carb there's a good sized light ring around the butterflies. Should they be closed almost to the point of touching? The carb has no air mixture screws on the secondary's. Thanks!

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I close em completely to start and make sure they sit nicely in the base plate and if they are even all the way around then set the primary w/just a square of t-slot showing and just crack the secondaries 1/4 turn from seated. If they`re uneven then loosen the screws slightly and center em up and go from there. 4150`s don`t always need to to be the same ft and rear on butterfly settings but it takes a bit of time to get em where they need to be based on your cars needs.............