The Melling MDK300 is a cylinder deactivation delete kit for GM 5.3L engines equipped with Active Fuel Management, including the LC9, LH6, LMG and LY5. It provides the parts needed to permanently remove the AFM/DOD system during a rebuild or upgrade, converting the engine to standard full-time operation on all eight cylinders. The kit is designed as a direct solution for engines where the deactivation hardware is being eliminated for durability or performance reasons.
Specifications:
- Type: AFM/DOD (Active Fuel Management) cylinder deactivation delete kit
- Engine family: GM 5.3L Gen IV, LC9, LH6, LMG and LY5
- Application: 2007-2014 GM 5.3L AFM engines
- Function: converts the engine to full-time 8-cylinder operation
- Part number: MDK300
FAQ
What does the Melling MDK300 do?
The MDK300 deletes the GM Active Fuel Management (AFM/DOD) cylinder deactivation system on 5.3L engines, returning the engine to full-time operation on all eight cylinders.
Which engines does the MDK300 fit?
It is designed for GM 5.3L engines with AFM, specifically the LC9, LH6, LMG and LY5 covering roughly 2007 to 2014.
Why delete the AFM system?
Enthusiasts and builders commonly delete AFM to improve long-term valvetrain reliability and to simplify the engine when upgrading the camshaft and related components.
Does the MDK300 include a tuner?
No. The MDK300 is the kit without a tuner. Melling offers the MDK300-HPT version that includes a tuner for the required ECM calibration.
