Big Boss Stage 1 performance cylinder head for 2010–2025 Cummins ISX and X15 (SOHC). High-nickel casting with all-Inconel intake and exhaust valves for exceptional strength and resistance to extreme temperatures. Stainless retaining clips.
Made in the USA. 2-year unlimited-mileage warranty.
Genuine PDI part supplied and installed by TDC Truck and Diesel.
