What does the 6.5" Hg rating mean for this power valve?

The 6.5 inches of mercury (in. Hg) rating indicates the amount of engine vacuum required for the power valve to open. A lower in. Hg rating means it opens with less vacuum, typically under heavier load conditions, to supply extra fuel.

What is the purpose of a power valve in a carburetor?

A power valve's main job is to enrich the fuel mixture under heavy engine load or wide-open throttle. It does this by opening when engine vacuum drops below its rated level, allowing additional fuel to flow into the carburetor's main circuits and prevent hesitation or bogging.

Does this power valve come with any installation hardware?

This product is for the power valve itself. Installation typically involves carefully removing the old power valve from the carburetor's metering block and installing the new one. Refer to your carburetor's service manual for specific installation instructions.

Edelbrock Single-Stage Power Valve Standard Flow 6 5 In Hg

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Specifications

Brand: Edelbrock
Part #: 12665
UPC: 85347126651

Edelbrock Single-Stage Power Valve Standard Flow 6 5 In Hg

Name: Edelbrock Single-Stage Power Valve Standard Flow 6 5 In Hg
Brand: Edelbrock
Price: 17.95 USD
Availability: InStock

$17.95

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Edelbrock Single-Stage Power Valve, 6.5" Hg. Helps prevent hesitation and bogging under load in many classic carburetors.

Key Features

Fits 112+ vehicle make/model combinations.
Single-stage power valve with a 6.5 inches of mercury (in. Hg) rating.
Uses engine vacuum to control fuel delivery during heavy load situations.
Helps eliminate hesitation and bogging by supplying additional fuel.
Compatible with Holley, Demon, and Quick Fuel carburetors.
Standard flow rate for broad application.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

If you're working on a classic carburetor setup, this Edelbrock Single-Stage Power Valve is a key component to keep your engine running smoothly. It's designed to work with popular carburetor brands like Holley, Demon, and Quick Fuel, and it uses engine vacuum to control when it opens. This means that when you're under heavy load or accelerating hard, the valve opens up to deliver extra fuel to the main system. This helps eliminate that frustrating hesitation or bogging you can get when the engine needs more fuel than the primary circuits can provide, ensuring a more consistent power delivery.

This particular valve is a standard flow model with a 6.5 inches of mercury (in. Hg) rating. The in. Hg rating tells you how much vacuum it takes for the valve to open. A 6.5 in. Hg rating is pretty common for many applications. Edelbrock makes these valves to help ensure your performance carburetor setup doesn't stumble when you need it most. It's a well-built part that's designed to fit right into compatible carburetors, making it a straightforward replacement if your old one is worn out or malfunctioning.

This power valve fits a wide range of vehicles from the late 70s and 80s, including many Chevrolet C/K trucks, Buick models, and Chrysler cars. It's a small part, but it makes a big difference in drivability when your carburetor is tuned correctly. Make sure to check the fitment data to see if it's right for your specific application.