There is one last tweak that will make your Holley 750 Vac Secondary as easy to adjust as it can possibly get, and that is replacing that vacuum canister with the QuickFuel adjustable vacuum secondary canister. Having to change out the springs to get the secondaries to open at just the right pace is a PITA. Turning a screw to get it just right is a breeze. Here's a pic of the part, and a shot of my carb with the QF installed and the adjusting screw circled. A sharp eye will also find the zip tie that holds the choke open that I mentioned in a the previous post.
