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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.

Holley Carburetor Tuning Secondary Circuit - Summit Racing Quick Flicks
Norm walks you though how to properly adjust the secondary circuit on a Holley 4 Barrel Carburetor. Vacuum Secondaries or Mechanical Secondaries it doesn't matter, Norm has you covered and achieving that top end speed. Find everything you need for your Holley Carburetor at http://www.summitracing.com/redirect?banner=SocialYT4535

Dyno Pull with Secondaries
Dyno pull of BB chevy with Holley vacuum secondaries

80508-1 750 Holley vacuum secondary
This is a Holley vacuum secondary carb, that is being testd on a running engine. This was filmed on an ipad2. www.carburetorsandmore.com