Edelbrock 12625 Single-Stage Power Valve 2.5" Hg

The Edelbrock 12625 is a single-stage power valve designed to optimize fuel delivery in Edelbrock carburetors during varying engine load conditions. This 2.5" Hg (inches of mercury) power valve uses engine vacuum to precisely control fuel enrichment, ensuring optimal air-fuel ratios across different operating conditions.

Key Features:

• 2.5" Hg vacuum rating for specific engine requirements
• Single-stage design for straightforward fuel enrichment
• Vacuum-operated opening and closing mechanism
• Direct replacement for Edelbrock carburetors requiring 2.5" Hg power valve
• Provides additional fuel flow during heavy load and wide-open throttle conditions

Power valves are critical carburetor components that activate under low vacuum conditions, such as during acceleration or heavy load. When engine vacuum drops below the valve's rating (2.5" Hg in this case), the valve opens to supply extra fuel to the main metering circuit, preventing lean conditions that cause hesitation, stumbling, or engine damage. This ensures smooth power delivery and proper drivability across all throttle positions.

Selecting the correct power valve rating is essential for optimal engine performance. The power valve rating should typically be set at one-half of your engine's idle vacuum reading for best results.