Looking for a reliable head gasket solution for your 6.7L Cummins under high-performance conditions? Our 6.7L Fire Ring Gasket is designed to handle extreme cylinder pressures, providing a superior seal that protects against leaks and failure—especially important as horsepower climbs beyond 800 HP.

Gasket Specifications

• Thickness: .066″ (1.75 mm)
• Wire O.D.: 4.560″ (using .105″ wire)
• Groove Radius: .017″–.018″ if cutting grooves in the head or block

Installation & Preparation

1. Studs Required

• Must use high-strength studs to achieve proper clamp load, particularly with our competition gasket.

2. Surface Flatness

• Ensure the head is within .003″ end-to-end for optimal sealing.
• Best practice: Machine both the head and block for perfect flatness.
• if you do not surface the block, be sure to use an axe sharpening stone with 320 or finer to clean up the deck surface.

3. Groove Cutting

• Engines <800 HP: cut grooves in the head
• Be sure to use 625 studs
• Always use a .120″ radiused cutter for precise groove formation.

4. Torque Procedure

• Initial Torque: 130 ft-lbs at startup.
• Hot Retorque: After reaching operating temperature, retorque while the engine is still warm.
• Check Valve Lash: Each retorque further compresses the gasket, reducing valve lash—re-adjust as needed.
• Final Check: Retorque at least once more before applying full load or RPM.

5. Proper Lubrication

• Apply a liberal amount of lube to the nut, washer, and threads so that all studs see a consistent clamp load.
• Never exceed manufacturer torque limits—fasteners at full torque store significant potential energy.

Why Choose Our 6.7L Fire Ring Gasket?

• Superior Seal under high boost and extreme pressures.
• Reduced Risk of Failure thanks to consistent clamp load and radiused grooves.
• Perfect for High-Power Builds, particularly those pushing beyond 800 HP.
• Proven Durability in severe-duty performance applications.