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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

Holley 600 cfm vacuum leaks

Vacuum Secondary vs Mechanical Secondary Carburetors - Summit Racing Quick Flicks
Learn the basic differences between mechanical secondaries and vacuum secondaries on carburetors. This video includes a brief description of how the secondaries operate and insights as to which style is right for your vehicle. http://www.summitracing.com/redirect?banner=SocialYT468

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