Cometic Thermostat Gasket

2002–2026 Chrysler / Dodge / Jeep 5.7L Hemi / 6.1L SRT8 / 6.4L 392

Part #: C5198

Overview

The Cometic Thermostat Gasket is a precision-engineered sealing solution designed specifically for Chrysler, Dodge, and Jeep vehicles equipped with 5.7L Hemi, 6.1L SRT8, and 6.4L 392 engines from 2002 through 2026. Crafted to ensure a perfect fit and reliable sealing, this gasket plays a critical role in maintaining the integrity of the engine’s cooling system by preventing leaks around the thermostat housing. Whether you are upgrading your high-performance vehicle or maintaining a daily driver, this gasket offers durability and dependable performance under demanding conditions.

Ideal for enthusiasts and professional mechanics alike, the Cometic Thermostat Gasket complements a 180-degree thermostat (sold separately) to optimize engine temperature regulation and cooling efficiency. Its robust design supports both steel and plastic thermostat housings, making it a versatile choice for a wide range of applications within the Chrysler, Dodge, and Jeep lineup.

Key Features

Engineered for precision and durability, the Cometic Thermostat Gasket offers the following key benefits:

• Constructed from soft durometer molded rubber for a precise, leak-free seal
• Compressed thickness of 0.028" ensures consistent sealing pressure
• Can be bonded to steel or plastic carriers to enhance rigidity and allow reusability
• Specifically formed to match the thermostat housing sealing surface or cavity
• Durable and long-lasting, suitable for both high-performance and daily-driven engines
• Compatible with a wide range of Chrysler, Dodge, and Jeep models from 2002 to 2026
• Designed to withstand the thermal and mechanical stresses of modern V8 Hemi and SRT engines

Construction & Design

The Cometic Thermostat Gasket is crafted from high-quality soft durometer molded rubber, selected for its excellent sealing properties and flexibility. This material conforms precisely to the contours of the thermostat housing sealing surface, ensuring a tight, leak-proof fit that resists coolant seepage. The gasket’s design allows it to be bonded to either steel or plastic carriers, which adds structural rigidity and enables the gasket to be reused during maintenance or upgrades.

With a compressed thickness of 0.028 inches, the gasket maintains optimal sealing pressure without compromising the thermostat housing fitment. This careful engineering ensures the gasket performs reliably under the high temperatures and pressures typical of 5.7L Hemi, 6.1L SRT8, and 6.4L 392 engine cooling systems.

Installation & Fitment

Installation of the Cometic Thermostat Gasket is straightforward and designed to fit directly onto the thermostat housing without modification. It is compatible with a broad range of Chrysler, Dodge, and Jeep vehicles, including but not limited to:

• 2002–2010 Dodge Ram
• 2005–2008 Dodge Magnum
• 2005–2010 Chrysler 300
• 2005–2010 Jeep Grand Cherokee
• 2006–2010 Dodge Charger
• 2008–2010 Dodge Challenger
• 2011–2014 Dodge Challenger and Charger
• 2011–2018 Ram 1500, 2500, 3500
• 2011–2021 Jeep Grand Cherokee
• 2011–2026 Dodge Durango
• 2015–2023 Dodge Challenger and Charger
• 2019–2024 Ram 1500
• 2019–2026 Ram 2500 and 3500
• 2022–2026 Jeep Grand Cherokee

No special tools or modifications are required, making it an ideal replacement gasket for routine maintenance or performance upgrades. For optimal results, it is recommended to pair this gasket with a compatible 180-degree thermostat (sold separately).

What's Included

• One Cometic Thermostat Gasket (Part # C5198)

Ideal For

This thermostat gasket is perfect for vehicle owners and performance enthusiasts who demand reliable cooling system sealing in their Chrysler, Dodge, or Jeep equipped with 5.7L Hemi, 6.1L SRT8, or 6.4L 392 engines. It is well-suited for both high-performance applications and everyday driving, providing peace of mind through durable construction and precise fitment. Mechanics and DIYers will appreciate its ease of installation and compatibility across a wide range of popular models spanning over two decades.

Cometic Gasket supplies high-performance sealing solutions for motorsports and high-stress engine builds, with a strong focus on modern gasket materials like multi-layer steel (MLS) head gaskets. Their catalog spans head gaskets and complete gasket sets across a wide range of applications, helping builders maintain reliable combustion and fluid sealing under extreme pressure and heat.