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Q:how does the block off valve work and will I still have good performance around town ?
A:That's a great question David! Racers sometimes prefer to race their cars without using a power valve. In these cases, the only way to properly block off the power valve circuit is with one of these power valve plugs from Mr. Gasket. They'll fit any Holley carburetor with 1/2-inch X 28 threads and they come with a new gasket. The fit applications with Holley Carburetor models like: 2300, 4150 HP, 4150, 4160, 4165, 4175, 4180, 4500 HP and 4500.