Cummins ISX15 X15 Upper Gasket Set | 5406187 | EPA10/13 | With Head Gasket

New upper engine gasket set for Cummins ISX15 / X15 / QSX15 engines, EPA10 and EPA13 emissions eras — base number 5406187. This is a complete upper set that includes the head gasket along with the valve cover, manifold, and thermostat gaskets plus the injector seals and O-rings needed for a cylinder head R&R. It does not include valve stem seals. Manufactured to meet or exceed OEM specifications.

Key Features:

• Upper engine gasket set for Cummins ISX15 / X15 / QSX15 engines, EPA10 and EPA13
• Includes the head gasket — a complete upper set, not a head-gasket-less kit
• Includes valve cover, intake/exhaust manifold, and thermostat/housing gaskets plus injector seals and O-rings
• Does not include valve stem seals — order separately if needed
• Direct replacement for Cummins 5406187; manufactured to meet or exceed OEM specs

Specifications:

• Base part number: 5406187
• Component type: Upper engine gasket set (includes head gasket)
• Condition: New
• Engine application: Cummins ISX15 / X15 / QSX15, 15 liter
• Emissions era: EPA10 / EPA13
• Head gasket: included
• Also includes: valve cover, manifold, and thermostat/housing gaskets; injector seals; O-rings and grommets
• Does not include: valve stem seals

Compatibility / Fitment:

• Cummins ISX15 / X15 / QSX15 engines, 15 liter, EPA10 and EPA13 emissions eras
• Emissions gate (important): this set covers EPA10 and EPA13. The EPA10-only upper set is a different number (4376104) — confirm your engine's emissions era before ordering
• Single-overhead-cam (SOHC) ISX/QSX applications — confirm your engine configuration
• Confirm your engine serial number / CPL and emissions configuration before ordering, as ISX15 gasket sets vary by build
• Verify against the gasket set / head configuration being replaced

Popular Cross-References / Interchanges:

• Cummins OE: 5406187, 4352146, 2881767
• Related (EPA10-only set): 4376104 — different emissions coverage; confirm before substituting
• More interchanges available in our Interchange Part Numbers tab

Conclusion:

The 5406187 is a new upper engine gasket set for Cummins ISX15 / X15 / QSX15 engines across the EPA10 and EPA13 emissions eras. It includes the head gasket plus the valve cover, manifold, thermostat, and injector seals for a complete cylinder head job, and does not include valve stem seals. Manufactured to OEM specifications for reliable sealing — confirm your engine's emissions era before ordering.