Upgrade your 12V Cummins (1989–1998) with our Fire Ring Gasket, engineered for reliable sealing under high boost and extreme horsepower. At .080″ thickness (1.8 mm) and 4.560″ wire O.D., this gasket is built to handle the stress of performance applications.

Gasket & Groove Specifications

• Thickness: .080″ (1.8 mm)
• Wire O.D.: 4.560″ (using .105″ wire)
• Groove depth: .016″–.017″   depth in cylinder head with a .120″ radius cutter
  

Recommended Installation Steps

1. Surface Preparation

• Machine Block & Head: Achieve maximum flatness for a proper seal—especially important if pushing horsepower beyond 800 HP.
• Grooves:
• Engines under 800 HP: Cut groove in just the cylinder head
• Engines over 800 HP: make sure you use a high tensile ARP 625 fastener
• Radiused Cutter: Always recommended for precise groove formation and the best gasket-to-wire contact.

2. Studs Are Essential

• Use Quality Studs: Ensure proper clamp load, vital for high-performance diesel applications.
• Generous Lubrication: Coat nuts, washers, and threads thoroughly to guarantee even torque across all studs.
• Manufacturer Torque Limits: Never exceed them—fasteners at full torque store significant potential energy.

3. Torque Procedure

• Initial Torque: 130 ft-lbs before first startup.
• Hot Retorque: After reaching operating temperature, retorque while the engine is still warm.
• Check Valve Lash: Each retorque compresses the gasket further, reducing valve lash—readjust as needed.

Why Choose Our Fire Ring Gasket?

• High-Horsepower Ready: Built to withstand demanding performance applications beyond 800 HP.
• Precision Engineering: .080″ thickness, radiused grooves, and .105″ wire for optimal sealing.
• Enhanced Reliability: Reduce the risk of head gasket failure with proper studs and consistent clamp load.
• Backed by Expertise: Trusted by diesel enthusiasts who demand durability and performance.