PDI Big Boss Inframe Kit for Cummins ISX | 6429516

Built for serious rebuilds. Trusted for real-world work. The PDI Big Boss In-Frame Overhaul Kit for Cummins ISX DOHC features laser-hardened top ring grooves for extended piston life, DLC-coated piston pins, and DLC-coated top piston rings—engineered for reduced friction, superior wear resistance, and long-term reliability. Rebuild with confidence. When your ISX engine needs an in-frame refresh, the PDI Big Boss Overhaul Kit delivers premium internal components designed to restore compression, reliability, and service life—without the downtime or cost of a full teardown. Built for high-hour, high-load applications, this kit is trusted by engine builders, fleets, and owner-operators who demand durability beyond standard replacement parts. Why Builders Choose Big Boss • Complete in-frame solution for Cummins ISX engines • Laser-hardened top ring grooves for increased piston durability • DLC-coated piston pins and top piston rings for reduced friction and wear • Precision-engineered components for consistent compression • Built for heavy-duty, high-mileage applications • Backed by PDI’s Big Boss Warranty What’s Included in the Kit This PDI Big Boss In-Frame Overhaul Kit includes the critical components required for a professional in-frame rebuild: • (6) Cylinder Kits (pistons, liners, and rings) • (6) Rod Bearing Sets • (6) Piston Oilers • (1) Main Bearing Set • (1) Upper Gasket Set • (1) Oil Pan Gasket Designed for Real-World Performance Every component in this kit is engineered to meet the demands of real-world heavy-duty use—long hours, sustained loads, and high operating temperatures. Big Boss overhaul kits are built to go beyond standard rebuild expectations, helping extend engine life and protect your investment. Fitment & Compatibility Fits: Cummins ISX DOHC Cummins Part Numbers 6429516, 5693815, 4376175 Why PDI? PDI designs and manufactures heavy-duty diesel engine components trusted by professionals across the industry. From overhaul kits, cylinder heads, injectors and supporting components, every product is built with a focus on strength, precision, and long-term reliability.