Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Engines and Components› Cylinder Heads and Components
Melling
Engine Cylinder Deactivation Delete Kit
SKU: M00L MDK300
Moderate — 2–4 hours
Overview
Show original supplier description
Part #: MDK300
Melling offers an Engine Cylinder Deactivation Kit for converting Active Fuel Management engines to a Non-Active Fuel Management engines. The Melling Deactivation Kit includes all components need to complete the changeover. Vehicle Will Not Be CARB Compliant After The Vehicles Engine Control Module/Power Train Control Module Is Reprogramed. All Melling Engine Cylinder Deactivation engine components are developed, engineered, tested and manufactured with the highest standards of quality and materials.
Features:
- Complete, Engine-Matched Solution: Each kit bundles premium non-deactivation lifters, valley cover/block-off plugs, gaskets, and hardware engineered for your specific applicationsaving time and ensuring everything fits right the first time
- Upgrades Reliability for the Long Haul: Replaces failure prone deactivation lifters with Melling's high strength conventional lifters, reducing risk of collapse, misfire, or the notorious lifter tick," and extending valvetrain service life
- Restores Full Time Power & Sound: Eliminates cylinder shut off logic so all cylinders stay active under every condition, delivering smoother throttle response, a consistent exhaust note, and the full performance your V8 was built to deliver
- Performance Ready Platform: Provides the solid valvetrain foundation required for aftermarket camshafts, higher spring pressures, and tuningunlocking more horsepower without system limitations, all backed by Melling's proven quality
- SEMA certified 49 state compliant, for off highway only use in California.
- Vehicle Will Not Be CARB Compliant After The Vehicles Engine Control Module/Power Train Control Module Is Reprogramed
LS AFM Delete Camshaft Kit For Active Fuel Management Engines
Vehicle Symptoms
- Rough idle at stoplights, especially when warm
- Engine misfire under light load or highway cruising
- Excessive oil consumption, blue smoke from exhaust
- Check engine light flashing or steady with misfire codes
- Loud ticking noise from engine, especially on cold start
Diagnostic Codes
- P0300 – Random/multiple cylinder misfire
- P0301 – Cylinder 1 misfire detected
- P0304 – Cylinder 4 misfire detected
- P0306 – Cylinder 6 misfire detected
- P0307 – Cylinder 7 misfire detected
- P0340 – Camshaft position sensor circuit malfunction
- P0420 – Catalyst system efficiency below threshold (Bank 1)
Relevant Conversations
- GM 5.3 AFM delete kit for LC9 engine
- 2010 Silverado 5.3 lifter failure rough idle
- P0300 P0301 P0304 on 5.3 engine fix
- Melling MDK300 install instructions
- Do I need a tune after AFM delete?
- 5.3L cylinder deactivation delete vs new lifters
- What causes oil consumption on GM 5.3 with AFM
- Best AFM delete kit for LMG engine
- Check engine light after lifter replacement
- How to disable Active Fuel Management permanently
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Melling |
| Part Number | M00L MDK300 |
Videos
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Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
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