This complete upper gasket set is designed for Cummins ISB 6.7L engines, offering everything needed for a top-end engine service, cylinder head replacement, or EGR/turbo reseal. Built to OEM specifications, the kit ensures proper sealing, prevents leaks, and maintains long-term engine reliability.

Fits:
Cummins ISB 6.7L (verify with engine serial number)

OEM Reference:

• 4376090

Kit Contents:

• O-Rings

  • 121364 | 2830977 – (1)

  • 121233 | 3058653 – (4)

  • 121264 | 3883284 – (1)

  • 321322 | 5P8211 – (1)

  • 121363 | 3973512 – (1)

  • 121337 | 3977393 – (6)

  • 321316 | 1075769 – (1)

• Gaskets & Seals

  • 3947530 – Intake Manifold Cover Gasket (1)

  • 3954829 – Thermostat Seal (1)

  • 3955393 – Valve Stem Seals (24)

  • 3963379 – Rocker Housing Gasket (1)

  • 3963824 – Rectangular Sealing Ring (1)

  • 3963988 – Seal (5)

  • 3963990 – Fuel Fitting Seal (5)

  • 3978072 – Intake Inlet Gasket (1)

  • 3979769 – EGR Valve Gasket (1)

  • 3999820 – Breather Gasket (1)

  • 4076823 – Rectangular Sealing Ring (2)

  • 4932210 – Cylinder Head Gasket (1)

  • 4932615 – Connection Gasket (2)

  • 5253019 – EGR Valve Gasket (1)

  • 3955339 – Exhaust Manifold Gasket (6)

  • 5260648 – Turbocharger Mounting Gasket (1)

  • 132037 – Valve Cover Gasket Kit (1)

  • 4931365 – Oil Drain Gasket (2)

Features & Benefits:

• All-in-one kit for top-end Cummins ISB 6.7 engine service

• OEM-spec materials for superior sealing and durability

• Clearly labeled and packaged for easy identification

• Ideal for head gasket jobs, turbo swaps, and EGR repairs