What does the '3.5 In Hg' rating mean for this power valve?

The '3.5 In Hg' refers to the vacuum level at which the power valve opens. 'Hg' stands for inches of mercury. This valve will open and supply extra fuel when engine vacuum drops below 3.5 inches of mercury, which typically happens under heavy load or full throttle.

What is the difference between single-stage and multi-stage power valves?

A single-stage power valve, like this Edelbrock 12635, has one specific vacuum threshold for opening. Multi-stage valves have multiple thresholds or a more complex operation, often used in more specialized carburetor setups. For most standard performance applications, a single-stage valve is common.

Does this power valve come with a gasket?

Yes, this Edelbrock power valve includes a gasket to ensure a proper seal when installed in your carburetor. Always ensure the mating surfaces are clean before installation.

Edelbrock Single-Stage Power Valve Standard Flow 3 5 In Hg

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Specifications

Brand: Edelbrock
Part #: 12635
UPC: 85347126354

Edelbrock Single-Stage Power Valve Standard Flow 3 5 In Hg

Name: Edelbrock Single-Stage Power Valve Standard Flow 3 5 In Hg
Brand: Edelbrock
Price: 17.95 USD
Availability: InStock

$17.95

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Edelbrock Single-Stage Power Valve Standard Flow 3.5 In Hg. Helps eliminate hesitation and bogging under load.

Key Features

Fits 112+ vehicle make/model combinations.
Single-stage power valve with standard flow.
Operates at 3.5 inches of mercury (Hg).
Uses engine vacuum to control fuel delivery.
Opens under heavy load to supply additional fuel.
Helps eliminate hesitation and bogging.

⚠️ 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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Will this fit your vehicle?

Product Details

This is the Edelbrock Single-Stage Power Valve, part number 12635. It's designed to work with many popular carburetors like Holley, Demon, and Quick Fuel, and it fits a wide range of vehicles from the early 80s through the early 90s, including models like the Chevrolet C10, Buick LeSabre, and Chrysler Cordoba.

The main job of this power valve is to use engine vacuum to control when it opens and closes. When you're really putting the pedal down, like during heavy acceleration or full throttle, this valve opens up to let more fuel into the main system. This helps prevent that frustrating hesitation or bogging you can get when the engine needs more fuel than the primary circuit is providing. It ensures smoother power delivery and better drivability.

This particular valve is rated at 3.5 inches of mercury (Hg) and is a standard flow type. It's a well-built component that helps keep your performance carburetor running smoothly.