BIG BOSS CAT B/C MODEL STAGE 1 CYLINDER HEAD cummins x15 tuner With high quality steel pistons

With high quality steel pistons

Factory Cross Reference for: 10r8501 and 10r0957

where as the shortened version is the "I-actually-work-this-truck" look

Airmesh sides and rear panels

This design with a stronger billet compressor wheel to help increase fuel efficiency

BIG BOSS CAT B/C MODEL STAGE 1 CYLINDER HEAD cummins x15 tuner With high quality steel pistonsAvailable for: 1984 1992 CAT 3406B and 3406C Model Key Benefits High Nickel Casting Improved Exhaust and Intake Valves Improved Cooling Passages Stainless Retainer Clips Made in the USA Warranty: 1 Year Unlimited Mileage PDI Big Boss CAT Stage 1 Cylinder heads are meticulously designed to surpass the most demanding expectations, making them the perfect choice for heavy duty applications in trucking, construction, agriculture, and more. They exemplify