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  1. Engine
    Hey y'all, I bought this Holley 4160 600cfm vac. secondary carb. It looks like someone tried deleting the vacuum function because the hole for the diaphragm was sealed up and there was a screw on the throttle linkage for the secondaries that was adjusted all the way to open with the primaries...
  2. Engine
    Alright so I've been ALL OVER the internet trying to find a good answer to this and I really haven't come up with much. How do you find your secondary jet size (with max HP in mind) on a traditional Vacuum Secondary Holley 4 Barrel without an AFR gauge or a drag strip to evaluate E.T.'s and...
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