Replacement Upper Engine Gasket Set for Cummins ® C/ISC/QSC/ISL/QSL Applications SS M-5579030 Cross Reference OEM Cross References: 4089978

What’s Included

1 x Upper Gasket Set – 1077708

Fits Application: Cummins 6C / ISC / ISL Series

The 4089978 Upper Head Gasket Set is designed for Cummins ISC 8.3L, ISL, and QSL engines, delivering OEM-quality sealing performance for top-end rebuilds and repairs. This kit includes premium gaskets, seals, and O-rings required to properly reseal the cylinder head, ensuring your engine maintains compression, prevents fluid leaks, and operates at peak performance.

Built with high-temperature resistant materials, each component is engineered to handle the extreme heat and pressure of heavy-duty diesel applications. Whether you’re working on an in-frame rebuild or preventative maintenance, this Cummins head gasket set provides a reliable and cost-effective solution.

Key Benefits

• OEM-quality replacement gasket set for Cummins ISC, ISL, and QSL engines

• Prevents coolant, fuel, and oil leaks for long-lasting reliability

• Manufactured with premium materials for durability under high loads

• Designed for heavy-duty applications: trucks, buses, and industrial equipment

• Includes all upper head gaskets, seals, and O-rings needed for installation

Applications

• Cummins ISC 8.3L Engines

• Cummins ISL Engines

• Cummins QSL Engines

Gasket Set Contents

• 6 × Copper Washer – PN 42092 / OEM 3906659

• 1 × Cylinder Head Gasket – PN 131742 / OEM 4981796

• 6 × Exhaust Gasket – PN 131706 / OEM 3937479

• 23 × Fuel Fitting Seal – PN 136102 / OEM 3963990

• 1 × Intake Connection Gasket – PN 131747 / OEM 3967891

• 1 × Intake Connection Gasket – PN 131812 / OEM 3975487

• 1 × Intake Gasket – PN 131818 / OEM 3970134

• 1 × Oil Return Gasket – PN 131480 / OEM 3937706

• Multiple O-Rings (various sizes & part numbers)

• 1 × Rocker Lever Housing Gasket – PN 131748 / OEM 3966708

• 5 × Seal – PN 136103 / OEM 3963988

• 1 × Turbocharger Mounting Gasket – PN 131813 / OEM 3921926

• 1 × Valve Cover Gasket – PN 131749 / OEM 3959798

• 24 × Valve Stem Seal – PN 192118 / OEM 3948578

• 1 × Washer – PN 136071 / OEM 3920773

Cross Reference / OE Numbers: 4089978, 131814, CUP131814, 5529494, 5579030

Details: Upper Gasket Kit

OE Replacements: 131814, 4089978, 5529494, 5579030

Application & Fitment

• Engine Make: Cummins
• Engine Model / Application: C/ISC/QSC/ISL/QSL

Confirm the original part number and engine identification before ordering. Where applicable, also verify serial-number range, production year, piston style, bearing size or other configuration notes shown in the product information.

Part Numbers & Cross References

• OEM Cross Reference: 4089978
• Interstate-McBee Reference: M-4089978

Need Help Confirming Fitment?

Use the engine model, serial number and original part number when checking compatibility. For kits and sets, review the complete component breakdown above before ordering because contents can vary by engine configuration.