Cummins ISX DOHC Cylinder Head | 4101420 | Fire Ring Performance | DCW Premium | New

New DCW Premium fire-ring performance cylinder head for the Cummins ISX / QSX dual-overhead-cam (DOHC) engine. Casting 4101420 is assembled in-house in the U.S. and ships fully loaded, with a machined fire ring for a metal-to-metal combustion seal on high-cylinder-pressure builds. This is the DOHC (dual-cam) head — it will not fit single-cam (SOHC) ISX15 engines (those use 4298234). A matching fire-ring head gasket set is required. Verify your engine (dual-cam) and serial before ordering.

Key Features:

• DCW Premium fire-ring performance cylinder head for the Cummins ISX / QSX dual-overhead-cam (DOHC) — CM570 / CM870 / CM871 (~2003–2010)
• Machined fire ring provides a metal-to-metal combustion seal for reliability under high cylinder pressures (tuned / high-boost / high-horsepower builds); it is a sealing and durability feature, not a power-adder
• Assembled in-house in the U.S. using American-supplied valvetrain components; multi-point QC before shipping
• Fully loaded with Inconel valves, springs, keepers, rotators/retainers, and valve stem seals; cam bearings and injector cups installed
• High-strength, alloyed cast iron designed for heavy-duty diesel applications

Every DCW Premium Cylinder Head Includes:

• New premium valves, valve springs, keepers, rotators/retainers, valve stem seals
• Precision-machined injector seating surfaces

Quality Control — Every Head Receives:

• Final inspection, machining verification, valvetrain QC checks, component verification, and assembly validation

Specifications:

• Base casting number: 4101420
• Component type: Loaded fire-ring performance cylinder head (DCW Premium)
• Condition: New Aftermarket
• Valve configuration: fire ring with Inconel valves, loaded (valves + springs)
• Material: high-strength, alloyed cast iron
• Camshaft: dual overhead cam (DOHC); cam bearings and injector cups installed
• Engine: Cummins ISX / QSX DOHC (CM570 / CM870 / CM871)

Warranty: Backed by the DCW Premium 2-year, no-questions-asked cylinder head warranty — covering overspeed, dropped injector tips, overheat events, valve-train failures, and non-defect-related cylinder head damage — plus 1 year of progressive damage coverage up to an additional $5,000 for warrantable defects that cause progressive engine damage.

Compatibility / Fitment:

• Cummins ISX / QSX dual overhead cam (DOHC) — CM570 / CM870 / CM871, approximately 2003–2010
• Cam gate: DOHC (dual-cam) only — will NOT fit single-cam (SOHC) ISX15 engines (those use casting 4298234). Verify your engine is dual-cam by serial number
• Fire-ring gasket required: this head requires a matching fire-ring head gasket set — a standard head gasket will not seal it
• Common cross-references: 4962732, 5413782, 4331387

Conclusion:

The 4101420 is a new DCW Premium fire-ring performance cylinder head for the Cummins ISX/QSX dual-overhead-cam engine (CM570/CM870/CM871), assembled in-house with Inconel valves and a machined fire ring for a durable combustion seal on high-pressure builds. It fits dual-cam engines only (not the SOHC ISX15) and requires a matching fire-ring gasket set. It's backed by the DCW Premium warranty — verify your engine is dual-cam by serial number before ordering.