In my opinion the Holley power valve is the most misunderstood circuit in the Holley carburetor. It’s a tricky enrichment circuit to get dialed in. I know Holley has a procedure using a vacuum gauge to find the “Proper Power Valve” but in my experience its never quite right. There are just too many variables that float around that circuit. So, providing one procedure that works for all combinations is just not feasible. In this video I will do my best to visually show you how the power valve effects cruising air fuel ratio in the hopes it will give you the knowledge to get your Hot Rod ripping without fouling plugs.

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#400CID #SBC #Carburetor

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