Keep your late-model Kawasaki heavy equipment running efficiently with an OEM-spec replacement cylinder head built for the rigorous duty cycles of modern earthmoving. The Daily Driver tier provides a standard, high-quality replacement cylinder head for the industrial QSB 6.7 engine utilized across multiple generations of Kawasaki loaders. Assembled using a renewed, pressure-tested OEM core combined with brand-new, high-quality internal components, this cylinder head guarantees reliable operation, proper combustion sealing, and extensive service life on the job site. It delivers standard fleet-grade performance, correcting factory casting stress points to eliminate unnecessary field downtime.

Component Breakdown

• Remanufactured Casting: Built from a high-quality OEM core casting that has passed rigorous diagnostic testing and is machined to like-new industrial specifications.

• New Wear Components: Equipped with all-new, high-quality valve seats, valve seals, and valve guides.

Key Features and Heavy-Duty Fixes

This modern 6.7L head features critical durability updates, backed by an intense inspection protocol to guarantee every commercial specification is met.

• 40 PSI Pressure Testing: After all machining work is completed, every cylinder head is pressure-tested at 40 PSI to confirm zero leaks and ensure absolute casting integrity before delivery.

• Blow-Proof Plugs: Threaded, blow-proof plugs are installed in the top of the head for superior leak prevention, replacing standard factory pressed-in freeze plugs that are prone to popping out during severe thermal expansion.

• Final Quality Control: The head undergoes a comprehensive final cleaning and strict inspection process. A detailed sign-off sheet is generated, measuring and recording critical specifications using a profilometer, including:

  • Valve Recessions

  • Stem Heights

  • Installed Spring Heights

  • Spring Pressures

  • Keeper and Lock Positions

  • Roughness Average (RA) Surface Finish

Recording this rigorous validation process ensures you receive a cylinder head that is significantly improved over the original factory design and ready for years of demanding loader operation.

Precision Machining Process

Choate Engineering Performance has incorporated critical modifications to address common failure points of the factory 6.7L cylinder heads, drastically improving field reliability:

• Optimal Sealing Surface: The deck is resurfaced to meet or exceed OEM specifications for Roughness Average (Ra), maximizing the sealing surface performance for the head gasket under modern high-injection-pressure loads.

• Valve Train Geometry Alteration: We custom blueprint the 6.7L head to alter valve height and valve recession, achieving maximum durability for high-cycle industrial applications.

• Lifter and Crosshead Longevity Fix: Valve stem heights are precisely altered to optimize geometry and remove excessive preload on the hydraulic lifter. This crucial modification decreases wear and significantly extends the life of the lifters, crossheads, and camshaft.

• Optimized Flow and Sealing: Valve seats are cut with a precise three-angle profile to optimize combustion efficiency and ensure a perfect seal.

• Valve Prep: Valves are reground and margins are meticulously inspected to guarantee proper sealing against the new seats.

• All-New Wear Components: New valve stem seals, valve seats, valve guides, and injector cups are installed across the entire assembly.

Meticulous Cleaning and Prep Process

Our commitment to quality begins before machining, with an intensive cleaning and stress-relieving process to ensure a flawless starting point:

• Magnetic Particle Inspection (MPI): Each core is subjected to MPI testing to thoroughly check for any cracks or subsurface imperfections common in high-hour castings.

• Thermal Stress Relieving: The head undergoes a stress-relieving process in a specialized furnace to bake away residual industrial oils and grease.

• Material Relaxation: The head is shot-blasted to strip rust and scale, a crucial step that relaxes the cast iron before any precision machining begins.

• Thread Prep: All broken factory bolts and studs are professionally removed to ensure threads are clean, chased, and ready for an effortless installation.