Holley Carb Vacuum Secondaries NOT Opening? - 5 MIN Tested/Explained/Repaired
are your holley vacuum secondaries working? here is how to test them in several different ways
How To Adjust Holley Carburetor Vacuum Secondary Springs
Holley offers some tips on how to properly operate and adjust four-barrel carburetors with vacuum secondary throttle blades. The video describes the various rate secondary springs, how to change them, and the testing procedures to follow to make sure the secondaries open properly for best performance.
Vacuum Secondary Test Drive
Did the mod. Tested it out. WOT tests to the speed limit. And a small blip for a 1/4 of a second. If you want to know more on the mod. Do it yourself. :) I know I misspelled response wrong. I'm not gonna pull it to change it.