Gator Fasteners HSK66L5P Head Stud Kit | 2017-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Features:

• Built for high-performance Duramax engines
• Handles 220,000 PSI tensile strength
• Prevents head gasket failure under boost
• Made from HD220 high-strength material
• Rolled threads for added durability
• Includes Gator Juice assembly lube
• Precision machined and heat treated
• Includes washers and nuts for install
• Perfect for towing and aggressive tuning
• Ideal for racing or sled pulling builds
• Direct replacement for factory head bolts
• Engineered for long-term reliability

Keep Your Engine in Check with a New Head Stud Kit

If you're putting serious power to the ground with your L5P Duramax, head studs aren't just an upgrade—they're a necessity. The Gator Fasteners Head Stud Kit is built to handle the high cylinder pressures that come with big boost, heavy loads, and aggressive tuning. Whether you're building a street truck, towing rig, or weekend sled puller, this kit gives your engine the clamping force it needs to stay sealed and reliable under extreme conditions. Unlike factory head bolts that can stretch and allow gasket failure, these studs are made from HD220 material with an incredible 220,000 PSI tensile strength. That means they’re designed to lock your heads down tight, even when the pressure’s on. Threads are rolled after heat treating to improve fatigue resistance, ensuring long-term durability in the harshest environments.

Straightforward Install

The kit includes everything you need for a proper install—studs, nuts, washers, and even Gator’s own “Gator Juice” assembly lube to make sure torque loads are applied evenly. It’s a complete, no-nonsense solution for anyone pushing their L5P beyond factory limits. And with precision machining and heat-treated components, you know you're getting quality that lasts. If you’re chasing horsepower or just want peace of mind under heavy towing, this is a rock-solid way to keep your head gaskets happy. Nothing bites like Gator.

Fits: 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025

Note: Forum postings could provide incorrect torque values. Please follow the included installation instructions for proper torque specifications and tightening sequence.

Install Instructions