Billet Coolant Block Off Plate

Features:

• CNC machined billet aluminum construction
• Durable thicker than OEM design
• Leak-resistant O-ring face seal
• High-quality Viton O-ring included
• Improved sealing over factory gasket
• Designed for long-term reliability
• Direct replacement for OEM plate
• Uses factory mounting hardware
• Corrosion-resistant aluminum finish
• Precision fit for Duramax engines
• Reduces risk of coolant leaks
• Built for heavy-duty applications

Upgrade Your Duramax Cooling System With Confidence And Reliability

When you are dialing in your Duramax, the last thing you want is a weak point hiding in your cooling system. The PPE billet coolant block off plate is designed to eliminate that concern with a stronger and more dependable solution than the factory setup. Instead of relying on a gasket that can wear down and eventually leak, this upgrade uses a precision O-ring seal that holds up over time. You get peace of mind knowing your truck is protected from slow leaks that can turn into bigger problems. Additionally, the billet aluminum construction adds a level of durability that feels right at home on a hard-working 6.6L Duramax. Installation stays simple since it reuses your factory hardware, so you are not stuck hunting for extra parts. Whether you are maintaining your truck or upgrading for long-term reliability, this is a small change that makes a noticeable difference. It is the kind of upgrade that keeps your build clean, dependable, and ready for whatever comes next.

Precision Machined Design Built For Long Term Sealing Performance

At the core of this PPE block off plate is a CNC machined billet aluminum body that delivers consistent fitment and strength. The increased thickness compared to the OEM plate helps resist warping and maintains proper sealing under varying temperatures. Furthermore, the integrated O-ring face seal design creates a more uniform sealing surface, which reduces the chances of coolant seepage over time. The included Viton O-ring is specifically chosen for its resistance to heat and chemical breakdown, making it ideal for long-term use in demanding engine environments. This design replaces the factory gasket system with a more reliable sealing method that requires less maintenance. What is more, the plate is engineered to install using factory fasteners, ensuring proper alignment without modification. Compatibility across 2001-2026 Silverado and Sierra 2500HD and 3500HD models with the 6.6L Duramax makes it a versatile upgrade. Every detail is focused on improving sealing performance while maintaining straightforward installation and dependable operation.

Fitment: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• Replaces failure-prone OEM gasket design
• Designed specifically for Duramax cooling system
• Requires reuse of factory mounting hardware
• Ensures proper O-ring seating during install
• Viton O-ring offers superior heat resistance
• Thicker design improves long-term sealing
• Ideal for maintenance or preventative upgrades
• No additional modifications required for install
• Helps prevent future coolant seepage issues
• Precision fitment critical for leak prevention