KUSHOP Billet Aluminum Coolant Plate for 2001–2017 Chevy/GMC 6.6L Duramax (LB7–L5P) — O‑Ring Seal, Direct-Fit

KUSHOP’s billet aluminum coolant plate is a direct replacement for the stock thermostat housing plate on 2001–2017 Chevy/GMC 6.6L Duramax engines, providing a precision O-ring seal and a durable, leak-resistant connection.

If you’re maintaining or upgrading a Duramax-powered truck (LB7, LLY, LBZ, LMM, LML, or L5P), this direct-fit coolant plate swaps into the factory location to restore a proper coolant seal and offer longer-lasting corrosion resistance than the original stamped or plastic pieces. Machined from solid billet aluminum, it resists warping and provides consistent clamping surface for the included O-ring, helping prevent coolant seepage where the thermostat housing meets the engine block.

How does this KUSHOP coolant plate fit my 2001–2017 Chevy/GMC 6.6L Duramax?

The plate is designed as a direct replacement to match factory mounting points and mating surfaces for LB7, LLY, LBZ, LMM, LML and L5P Duramax engines from model years 2001–2017. Installation follows the original plate’s bolt pattern and uses the provided O-ring for a secure seal.

• Direct-fit design for specified Duramax engine codes
• Uses original bolt locations—no drilling or modification
• Includes O-ring sized to OEM interface for reliable sealing
• Compatible with stock thermostat housings and most OEM cooling components

What are the materials and durability advantages of a billet aluminum plate?

Billet aluminum is more rigid and corrosion-resistant than stamped steel or molded plastic, so it maintains flatness under torque and thermal cycles. That reduces the risk of leaks caused by material distortion and extends the service life of the sealing surface.

• Machined from solid billet for greater strength and precision
• Improved resistance to corrosion and heat-related warping
• Consistent sealing surface for even O-ring compression
• Lightweight compared with cast alternatives while staying robust

What comes with the replacement plate and what do I need for installation?

The product ships as a complete coolant plate assembly with an appropriately sized O-ring to ensure a tight seal. Basic hand tools and torque specifications matching OEM guidelines are all that’s required for a straightforward swap.

• Billet aluminum coolant plate from KUSHOP
• Pre-sized O-ring for the mating surface
• Simple install using common hand tools and factory bolts
• Installation time typically under one hour for experienced technicians

Who is this part for? This KUSHOP coolant plate is aimed at Duramax owners, DIY mechanics, and professional shops who want a resilient, OEM-compatible replacement for a leaking or damaged thermostat/coolant plate. It’s especially useful when the factory part shows signs of corrosion, cracking, or distortion, or when you’re performing an engine service and prefer a long-lasting metal upgrade over stock plastic or stamped components.