Big Boss Stage 2 performance cylinder head for 2010–2025 Cummins ISX and X15 (SOHC). High-nickel casting with all-Inconel intake and exhaust valves for extreme-temperature strength and durability. Stainless steel fire-ring for extra protection in higher-horsepower applications.
Enhanced airflow, revised combustion chambers, and improved cooling passages. Ideal for heavy-duty trucking, construction, and agriculture.
Made in the USA. 2-year unlimited-mileage warranty.
Genuine PDI part supplied and installed by TDC Truck and Diesel.
