Description
New Cummins ISB 24V 5.9L Loaded Complete Reinforced Cylinder Head (Casting 3943627 / 5361587)
Premium Heavy-Duty Replacement — Fully Loaded & Ready to Install
Upgrade your engine with this brand new, fully loaded complete reinforced cylinder head designed specifically for Cummins ISB 24V 5.9L applications. Engineered as a direct OEM replacement, this heavy-duty aftermarket casting features increased internal wall thickness and higher nickel content to prevent cracking and premature valve train failure. It arrives pre-assembled with premium components for a seamless, immediate installation that restores long-term reliability to your vehicle.
🛠️ In-House Machining Process
- Debris-Free Preparation: Every new casting is chemically cleaned and blown out to remove all residual machining oils and manufacturing debris. This ensures your engine’s oiling system remains uncontaminated from the first start-up.
- In-House Precision Machining: Unlike “shelf-stock” heads, we perform all final machine work in-house. This includes final guide sizing and precision valve seat cutting to ensure perfect geometry and clearances.
- Pressure & Integrity Testing: To go beyond the factory standard, we pressure-test every head to 60 PSI. This verifies that the casting is free of porosity leaks or internal defects that could compromise the cooling system.
- Dimensional Inspection: Our technicians perform a multi-point inspection of the gasket-sealing surface. This ensures the head is perfectly flat and meets tight OEM tolerances for a flawless fit.
- Professional Assembly & Setup: Valvetrain components are installed and verified in a clean-room environment. Each head comes fully assembled with valves and springs, ready for a direct bolt-on installation.
- Vacuum-Seal Verification: Every intake and exhaust port is Vacuum Tested. This guarantees a 100% airtight seal between the valves and seats, ensuring maximum compression right out of the box.
📊 Technical Specifications
- Engine Size: 5.9L
- Valves: 24V
- Casting Numbers: 3943627, 5361587
- Condition: Brand New
- Material: Heavy-Duty Reinforced Cast Iron
- Configuration: Complete / Fully Loaded Assembly
- OEM Replacement #: 3942628, 3943627, 3943628, 3943892, 3944991, 3944992, 3944993, 3944994, 3944995, 3945524, 3946202, 3937729, 3957403, 3990135, 3991771, 3991772, 3991773, 5361587
- Core Return Required
🚘 Common Applications
Direct fit for Cummins ISB 24V 5.9L engines found in:
- Years: 1998–2003
- Fitment: Fits both electronic and non-electronic variations of the 24-valve 5.9L Cummins ISB turbo diesel motor.
- Vehicle & Equipment Types: Light/Heavy Duty Trucks, Medium Duty Commercial Vehicles, and Industrial Equipment.
📦 Core Return & Warranty
- Core Process: No upfront core fee. Receive your new head and compare it to your original before installation. Once complete, use the pre-paid return label included in your shipment. Cores must be returned within 30 days. Click here for Core Policy.
- Warranty: Includes a 2-Year Warranty covering defects in materials and workmanship. Click here for Warranty details.
- Please Note: Parts, marine, and performance items carry specific warranty limitations — please review our full Warranty Policy for details.
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