Cummins ISX15 Fire Ringed Cylinder Head | 4298234 | High Performance | New

New aftermarket fire-ring cylinder head for Cummins ISX15 (also sold for off-highway QSX15) single-overhead-cam (SOHC) engines, EPA10/13 emissions era, casting 4298234, machined for a fire-ring combustion seal and fitted with Inconel valves. Supplied fully assembled with valves and springs — injectors not included; reuse your existing injectors or supply a replacement set. Built for high-horsepower and modified ISX15 builds, where the machined fire ring provides a metal-to-metal seal that holds up under elevated cylinder pressures. Fits single-camshaft ISX/QSX engines only; it will not fit dual-overhead-cam (DOHC) ISX engines, which use a different head. Brand-new casting with no core charge. Requires a compatible fire-ring head gasket set.

Key Features:

- Machined fire ring — adds a metal-to-metal combustion seal around each cylinder for reliability under the high cylinder pressures of tuned, high-boost, or high-horsepower builds; helps prevent head gasket blowout. A sealing upgrade over a standard head, not a power-adding part on its own.

- SOHC-specific fitment — fits single-overhead-cam ISX15/QSX15 engines only; will NOT fit dual-cam (DOHC) ISX engines, which require a different head. Confirm your engine has one camshaft before ordering.

- Inconel valves for heat and corrosion resistance at high exhaust-gas temperatures

- Loaded and ready to run — supplied assembled with valves and springs; injectors not included (reuse your existing set or supply a replacement)

- Cast-iron 24-valve head (4 valves per cylinder); base part 4298234

- Brand-new casting — no core charge and no core return required

Specifications:

- Base part number: 4298234

- Component Type: Loaded cylinder head assembly, SOHC — fire-ring machined, performance build

- Seal / valve configuration: Machined fire ring; Inconel valves; 24-valve (4 valves per cylinder)

- Included: valves and springs (loaded); injectors NOT included

- Required companion part: Fire-ring head gasket set — a standard head gasket will not seal a fire-ring head

- Condition: New Aftermarket

- Material: Cast iron

- Engine: Cummins ISX15 / QSX15, inline-6, 15.0 L, SOHC, 24-valve

- Emissions era: EPA10 / EPA13

Compatibility:

Cummins ISX15 (on-highway Class 8 trucks — North America's most popular heavy-duty engine) and QSX15 (off-highway: industrial, mining, marine, power generation), EPA10 / EPA13 emissions era, single overhead cam (SOHC) only, aimed at high-horsepower and modified builds. Also fits engines badged X15, the 2017+ name for the same 15L platform. This head will NOT fit dual-overhead-cam (DOHC) ISX engines (two camshafts); those use a different cylinder head. Installation requires the correct fire-ring head gasket set and proper torque procedure. Configuration can vary within the ISX15 line, so confirm your engine serial number / CPL before ordering.

Conclusion:

New aftermarket fire-ring Cummins ISX15/QSX15 cylinder head, base part 4298234, for single-overhead-cam (SOHC) EPA10/13 engines only. Machined for a metal-to-metal fire-ring combustion seal and fitted with Inconel valves, supplied loaded with valves and springs; injectors not included. Built for high-horsepower and modified ISX15 builds that push cylinder pressures beyond what a standard head gasket reliably holds — a sealing and durability upgrade, not a power-adding part on its own. Requires a compatible fire-ring head gasket set. Confirm single-cam configuration and engine serial/CPL before ordering — this head does not fit dual-cam DOHC ISX engines.