’89–’98 Fire Ring Gasket – .070″ Thickness, 4.560″ Wire O.D.

Upgrade your 12V Cummins (1989–1998) with this Fire Ring Gasket, specially engineered to handle high boost pressures and extreme horsepower. With a .070″ thickness (1.5 mm) and .105″ wire at 4.560″ O.D., you’ll gain a robust seal that stands up to the stresses of heavy-duty and performance applications.

Gasket & Groove Specifications

• Thickness: .070″ (1.5 mm)
• Wire O.D.: 4.560″ (.105″ wire)
• Groove depth
  • .025″–.026″ depth with a .120″ radius cutter

Installation Best Practices

1. Machining for Flatness

   • Achieve maximum sealing by machining both the head and block—especially crucial over 800 HP.
   • Under 800 HP: Cutting grooves in just the head
   • Over 800, be sure to run 625 studs
   • Always use a .120″radiused cutter for precise, consistent groove profiles.

2. Studs Are Essential

   • Use quality studs to ensure proper clamp load—especially with our competition gasket.
   • Apply liberal lubrication on nuts, washers, and threads for even torque and a consistent seal.
   • Never exceed the manufacturer’s torque limits; fasteners at full torque store significant energy.

3. Torque Procedure

   • Initial: Torque to 130 ft-lb before the first startup.
   • Hot Retorque: After reaching operating temp, retorque while the engine is warm.
   • Check Valve Lash: Gasket compression changes valve lash; readjust as needed.

Why Choose Our Fire Ring Gasket?

• Reliable High-Performance Sealing: Tested to handle extreme pressures for racing, towing, or heavy-duty use.
• Proven Durability: .070″ thickness ensures a tough, stable seal in boosted applications.
• Ease of Installation: Straightforward torque procedure with standard machining practices.
• Trusted Expertise: Backed by Hamilton’s long-standing commitment to diesel innovation.

Upgrade to our Fire Ring Gasket for your ’89–’98 Cummins and confidently push the limits of power. Thank you for choosing Hamilton products for your diesel performance needs!