Holley Power Valve and How to tune power valve along with so much more info. I've got my carb ls dialed in and I thought I'd show you how to set up one of the most viable items on your carb. On my carbureted ls I installed a vacuum gauge and an AFR gauge and went to town. Theres very little info when it comes to a holley carb and much less when you get into the PVCR, IAB, IFR etc. Tuning a holley carb is easy, once you know how all the systems operate. Hopefully this helps someone in the future looking to modify their holley 600 650 750 vacuum secondary or double pumper. Trying to catch up to the driveway engineer so lend me your power!

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