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4089478 | Cummins L10 Upper Engine Gasket Set

Pricing: $207.65

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These aren't your grandpa's gaskets.

A blown gasket can be anything from a minor annoyance to leaving you stranded on the side of the road. You don't have to put up with whatever gasket you can get your hands on; our gaskets are engineered to withstand anything you throw at it and last well into another million miles. No doubt about it, these are some of the best gaskets sets on the market.

It's no secret that diesel engine parts can cost an arm and a leg. That's where HHP’steps in. We offer premium aftermarket gaskets (sets) at up to 50% off OEM prices. While most believe aftermarket retailers sell cheap gaskets with zero warranty, packed in a dusty box from who knows where, HHP is here to kick that stereotype to the curb. HHP provides Gaskets fabricated for unstoppable performance and a 2-Year Parts and Labor Warranty. How's that for an aftermarket part?

Need a little extra proof? Let's talk shop.

  • All gasket set components are built to OEM specifications. You'll receive equal or better quality compared to the OE at a much lost price.
  • Manufactured and assembled in an ISO 9001: 2008 Certified facility to ensure premium quality and consistency.
  • No need to weed through the parts catalog, this kit contains all the gaskets necessary to refresh and reseal the top section of your engine.
  • Gaskets proudly made right here in the U.S.A. and use 100% Asbestos-Free Material.
  • We have ASE certified techs on staff to answer all of your technical questions. You'll be back up and running in no time!


  • (1) Upper Engine Gasket Set
    • (7) O-Rings
    • (6) Exhaust Manifold Gaskets
    • (1) Connection Gasket
    • (1) Rocker Lever Housing Gasket
    • (1) Cylinder Head Gasket
    • (1) Cover Plate Gasket
    • (3) Turbocharger Gaskets
    • (1) Oil Drain Gasket
    • (7) Washers
    • (7) Grommet Seals
    • (1) Intake Manifold Gasket


2-Year Parts and Labor Warranty

OEM Applications:

  • 4025157
  • 4089478

Technical Data

Note on the L10: Casting numbers change with the CPLs

L10 Engine Specifications:
Year: 1985-1990
Liter: 10.0
CID: 611
Cylinder: L 6
Bore/Stroke: 4.9210-4.9270",5.354"
Compression Ratio: 16.3:1
Firing Order: 1-5-3-6-2-4

Tune-Up Specifications:
Oil Pressure At Idle: 10 Psi Minimum
Oil Pressure: 30 Psi @ 1200 RPM or Peak Torque
Intake Valve Lash: .014" Cold
Exhaust Valve Lash: .027" Cold

L10 Engine Specifications:
Year: 1991-1996
Liter: 10.0
CID: 611
Cylinder: L 6
Bore/Stroke: 4.9213-4.9228", 5.354"
Compression Ratio: -
Firing Order: 1-5-3-6-2-4

Tune-Up Specifications:
Oil Pressure At Idle: 10 Psi Minimum
Oil Pressure: 30 Psi minimum @ 1200 or peak torque
Intake Valve Lash: .014"Cold
Exhaust Valve Lash: .027" Cold



Shipping Information

  • Item Requires Shipping
  • 5.2 lbs.
  • W13.0000” x H3.0000” x L43.0000”

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