Big Boss Stage 2 performance cylinder head for 1999–2009 Cummins ISX (DOHC). High-nickel casting, all-Inconel intake and exhaust valves, stainless steel fire-ring for higher-horsepower protection, enhanced airflow and combustion chambers.
Made in the USA. 2-year unlimited-mile warranty.
Genuine PDI part supplied and installed by TDC Truck and Diesel.
