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How Carburetors Work

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Located in the metering block, the power valve is easily accessible and replaceable. Power valves are rated at the inches of manifold vacuum at which they open. For instance, if an engine pulls 7.5 inches at idle, the carb should be fitted with a numerically lower (2.5-,3.5-, 4.5-, 5.0-, or 6.5) power valve to prevent running overly rich.
How Carburetors Work - Carbin' It Easy

 Located in the metering block, the power valve is easily accessible and replaceable. Power valves are rated at the inches of manifold vacuum at which they open. For instance, if an engine pulls 7.5 inches at idle, the carb should be fitted with a numerically lower (2.5-,3.5-, 4.5-, 5.0-, or 6.5) power valve to prevent running overly rich.  View Related Article

 

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