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My crate motor experienced a backfire. How do I know if the Carburetors Power Valve was damaged?

April 26, 2017backfire Carburetor crate damaged experienced motor power valve

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My crate motor experienced a backfire. How do I know if the Carburetors Power Valve was damaged?

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Since 1992 all Holley Carburetors have backfire protection built into them. It is unlikely that a backfire will cause any damage to the Carburetor. However, it is possible that an extreme backfire may create more percussion than the backfire protection can handle. If the engine experienced an extreme backfire, the Power Valve can be tested by turning the Idle Adjustment Screws all the way in with the engine idling. If the engine stalls, the Power Valve is not damaged. Reset the Idle adjustment Screws to their original starting position.