Advanced Engine Design 5045 4.5" Power Valve for Holley Carburetors

The Advanced Engine Design 5045 is a high-quality, high-flow power valve engineered specifically for Holley performance carburetors. This single-stage power valve is designed to enhance fuel delivery and improve overall carburetor performance in performance and racing applications.

Key Features:

• 4.5 inches Hg vacuum opening rating for precise fuel enrichment control
• Single-stage, high-flow design for optimal performance
• Compatible with Holley 2300, 4150, 4160, and 4500 series carburetors
• Includes gasket for proper installation
• Four-door design for reliable operation
• Made in the USA with high-quality materials

Power valves add extra fuel to the fuel mixture when engine vacuum drops and a richer fuel mixture is needed during acceleration or heavy load conditions. The 4.5" Hg rating means this valve opens when manifold vacuum drops to 4.5 inches of mercury or below. For optimal performance, always select a power valve rated below your engine's lowest manifold vacuum reading at idle in gear. This ensures proper fuel enrichment during acceleration while preventing overly rich conditions during cruise.