Melling Engine Expansion Plug Kit

2002–2026 Chrysler, Dodge, Jeep, Ram 5.7L / 6.1L / 6.2L / 6.4L Gen 3 HEMI Engines

Part #: MEP-337

Overview

The Melling Engine Expansion Plug Kit (MEP-337) is a precision-engineered solution designed specifically for Gen 3 HEMI engines found in a wide range of Chrysler, Dodge, Jeep, and Ram vehicles from 2002 through 2026. This kit is essential for enthusiasts and professionals performing an MDS (Multi-Displacement System) delete, providing a reliable and secure method to block off the oil galley passages after removing the factory MDS solenoids.

By installing these high-quality block off plugs, you maintain proper engine oil pressure and prevent leaks that can occur when the MDS components are removed. Manufactured in the USA to meet or exceed OEM specifications, this kit ensures long-lasting durability and engine integrity without compromise.

Key Features

The Melling MEP-337 kit is engineered for optimal fit and dependable performance, making it the ideal choice for a clean and effective MDS delete. Key features include:

• Precision engineered for a perfect fit on Gen 3 HEMI 5.7L, 6.1L, 6.2L, and 6.4L engines
• Manufactured from high-quality materials for consistent durability and longevity
• Designed to withstand high-temperature and high-pressure engine conditions
• Meets or exceeds original equipment manufacturer (OEM) specifications
• Provides a secure, leak-proof seal to block oil galley passages after MDS solenoid removal
• Includes all four block off plugs required for a complete MDS delete
• Made in the USA for assured quality and reliability

Construction & Design

The expansion plugs in this kit are crafted from premium materials engineered to endure the demanding environment inside the engine block. Their robust construction ensures a tight, leak-proof seal within the oil galley passages, preventing oil pressure loss and maintaining optimal engine performance.

Each plug is precision machined to exact tolerances, guaranteeing a seamless fit that aligns perfectly with the Gen 3 HEMI engine architecture. Attention to detail in manufacturing and material selection results in a product that offers long-lasting durability and worry-free operation, even under the extreme conditions typical of performance engines.

Installation & Fitment

Installing the Melling MEP-337 kit is straightforward for anyone familiar with engine maintenance or upgrades. The process involves removing the factory MDS solenoids from the engine block and replacing them with the supplied block off plugs. No additional modifications or machining are required, making this an efficient and clean solution for MDS delete applications.

This kit is compatible with a broad range of vehicles equipped with Gen 3 HEMI engines, including:

• 2005–2010 Chrysler 300 6.1L
• 2009–2013 Dodge Challenger 5.7L
• 2015–2023 Dodge Challenger 5.7L, 6.2L, 6.4L
• 2008–2010 Dodge Challenger 6.1L
• 2011–2013 Dodge Challenger 6.4L
• 2006–2010 Dodge Charger 6.1L
• 2015–2023 Dodge Charger 6.2L
• 2021, 2023–2025 Dodge Durango 6.2L
• 2006–2008 Dodge Magnum 6.1L
• 2003–2005 Dodge Ram 1500 5.7L
• 2005–2010 Dodge Ram 2500 5.7L
• 2006–2008 Dodge Ram 3500 5.7L
• 2006–2010 Jeep Grand Cherokee 6.1L
• 2018–2021 Jeep Grand Cherokee 6.2L
• 2021–2024 Ram 1500 6.2L
• 2011–2018 Ram 2500 and 3500 5.7L

What's Included

• Four high-quality oil galley block off plugs
• Complete kit ready for MDS delete installation

Ideal For

This Melling Engine Expansion Plug Kit is ideal for performance enthusiasts, mechanics, and tuners who want to perform a reliable MDS delete on Gen 3 HEMI engines. It is perfect for those seeking to eliminate the MDS system for improved engine response, simplified maintenance, or compatibility with aftermarket tuning solutions. Additionally, it serves as a durable, OEM-quality replacement for factory MDS solenoid plugs, ensuring engine integrity is maintained after MDS removal.

Melling is an engine-parts manufacturer best known in performance circles for oil pumps, camshafts, and valvetrain/timing components. Their performance line focuses on parts that support stable oiling and durability—key foundations for high-RPM and high-load builds where lubrication and valvetrain control are critical.