Advanced Engine Design 7890 Power Valve Saver Kit for Holley Carburetors

The Advanced Engine Design 7890 Power Valve Saver Kit provides essential blowout protection for Holley carburetor power valves. This kit protects the power valve vacuum channel against elevated manifold pressure caused by engine backfires, preventing costly power valve diaphragm failures that can lead to rich running conditions and poor performance.

Key Features:

• Complete protection system with spring, brass seat, and check ball
• Fits Holley 2300, 4150, 4160, 4165, and 4175 model carburetors
• Ideal for retrofitting pre-1992 Holley carburetors without built-in protection
• Includes proper size drill bit with stop for accurate installation
• Complete hardware and detailed instructions included
• Easy installation directly into throttle body

The check ball system is designed to remain normally open during operation but quickly seals to close off the internal vacuum passage when a backfire occurs, interrupting the pressure wave before it can damage the power valve diaphragm. This simple yet effective upgrade can save you from unexpected carburetor failures and the performance issues that result from a blown power valve.