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Edelbrock 12685 Power Valve Single-Stage 8.5" Hg

(Ford F-150 1975-79, 1984-87, Mustang 1964-73, 1983-85, F-250 1955-66, 1973-79, 1983-87, Thunderbird 1955-76, F-350 1955-66, 1973-79, 1983-87 + 423 more models)

Manufacturer

Picture for manufacturer Edelbrock

Part Number

12685
6 reviews
Sale Price

$17.95

In Stock (10+)

delivery box

Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Edelbrock 12685 is a single-stage power valve calibrated to open at 8.5 inches of mercury (Hg) vacuum. This precision-engineered valve is designed for use in Edelbrock carburetors to optimize fuel delivery under varying engine loads.

How It Works:

Power valves use engine vacuum signals to regulate fuel enrichment. Under cruise conditions with higher manifold vacuum, the valve remains closed. When engine load increases during acceleration or wide-open throttle—causing vacuum to drop—the power valve opens at its calibrated 8.5" Hg threshold. This allows additional fuel to flow into the main metering system, preventing lean conditions that cause hesitation, stumbling, or engine damage.

Key Features:

  • Single-stage design with 8.5" Hg opening point
  • Direct replacement for Edelbrock carburetors
  • Eliminates hesitation and bogging under load
  • Ensures proper air/fuel ratio during acceleration
  • Precision calibrated for consistent performance

Selecting the correct power valve opening rate is critical for optimal carburetor performance. The 8.5" Hg rating makes this valve suitable for engines with moderate camshaft profiles. Always verify your engine's manifold vacuum at idle to select the appropriate power valve rating.

Products specifications

Fits

Ford F-150 1975-79, 1984-87, Mustang 1964-73, 1983-85, F-250 1955-66, 1973-79, 1983-87, Thunderbird 1955-76, F-350 1955-66, 1973-79, 1983-87, Galaxie 500 1962-74, F-100 1955-66, 1973-76, 1979, Fairlane 1955-70, Torino 1968-76 + 419 more models

Type

Standard Flow

Gasket Or Seal Included

Yes

Opening Vacuum

8.5 in. Hg

Quantity

Sold individually

RGL

WARNING: This product can expose you to Chromium, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.

Single Or Dual Stage

Single

Easy and efficient

Good and fast

Great Price for my order

Very happy experience. Package arrived early

Thanks had a hard time finding this shock

Found what I needed quickly and easily. Thanks!

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