Explore our full line of inframe overhaul kits for CAT C15 and C15 ACERT engines, featuring trusted OEM cross-reference part numbers like 10R8501, 10R8502, 10R8503, 10R9923, and 10R9924. Whether you're rebuilding a single turbo 6NZ or a twin turbo MXS, our kits include everything you need—liners, pistons, bearings, seals, and gaskets—to get your engine back to work. We stock premium brands like AFA, Interstate-McBee, and PAI to match your horsepower goals and budget. Designed to fit popular serial number prefixes including MXS, NXS, BXS, and 6NZ. Fast shipping and expert support from Texas Truck Market.