DNJ Engine Components LIF3172 Valve Lifter AFM Deactivation Lash Lifter

The DNJ Engine Components LIF3172 is a precision-engineered deactivation valve lifter designed for GM engines equipped with Active Fuel Management (AFM) systems. This specialized lifter plays a critical role in the AFM cylinder deactivation technology found in many GM V8 engines, allowing the engine to switch between four-cylinder and eight-cylinder operation for improved fuel economy.

Key Features:

• OE-quality replacement deactivation lifter for AFM/DOD systems
• Precision-engineered to meet or exceed OEM specifications
• Designed for proper valve operation in cylinder deactivation mode
• Compatible with 4.3L to 6.2L GM V8 engines with AFM
• Works with the Valve Lifter Oil Manifold (VLOM) system
• Manufactured by DNJ Engine Components with over 30 years of experience

This deactivation lifter is commonly used in applications for Buick, Cadillac, Chevrolet, GMC, Isuzu, Pontiac, and Saab vehicles equipped with Active Fuel Management. The LIF3172 is often sold as part of valve lifter kits alongside standard lifters (such as LIF3104) for complete AFM system service. Proper installation requires attention to the AFM oiling system, including the VLOM, lifter guides, and oil pressure specifications to ensure reliable operation.

Installation Note: When replacing AFM lifters, it is recommended to also replace lifter guides, inspect or replace the VLOM filter, and verify proper oil pressure for the AFM system's 27-66 PSI operating range.