The experience was excellent. My part came sooner than expected and was exactly as advertised. This is how a business should be run. I would give 6 stars if I could, thank you HDPC
Best prices and customer service on Duramax LML heads out there. Shipped fast and very cool about how long it took to get the cores back.
Bought a pair of Remanufactured GM Chevrolet 6.2L Casting #549 Cylinder Head Direct Injection from these guys great product and service.
Replacement heads for my 3.5 EcoBoost worked perfect. The kit had everything I needed. The customer service was excellent. Highly recommend this company.
Cummins ISX / QSX Heavy-Duty Valve Set | 21-4N Martensitic & Austenitic Stainless (24pc)
$379.00
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Additional Info
Cummins ISX / QSX Heavy-Duty Valve Set | 21-4N Martensitic & Austenitic Stainless (24pc) 📊
Stop praying for your engine to survive another haul and start installing the professional-grade solution for your Cummins ISX or QSX platform.
This is the definitive 24-piece valvetrain kit engineered for high-performance diesel endurance. Built using the sacred 21-4N High-Temp Stainless Steel, these valves are designed to resist “tuliping,” snapping, or burning up under the extreme EGTs and pressures of heavy-duty hauling.
🛠️ The Dual-Alloy Advantage
- Intake Valves (Martensitic SS): Forged from high-grade Martensitic alloy to provide a rigid structural backbone. These are immune to the fatigue and corrosion that crush lesser “budget” components.
- Exhaust Valves (Austenitic 21-4N): Designed to live in the furnace. These thrive in extreme heat, resisting oxidation and warping even when your turbocharger’s wake reaches peak temperatures.
- Precision Ground Seats: Features 20° Intake and 45° Exhaust angles, precision-ground for a gas-tight, high-pressure seal that restores lost compression instantly.
- Ultra-Tight Stem Tolerances: Held to .3789″ stem diameter specifications to eliminate guide slop and oil consumption upon installation.
- Single-Groove Lock: Engineered for maximum security, ensuring the valves stay locked in place regardless of RPM or load.
📊 Technical Specifications
- Condition: Brand New High-Performance
- Quantity: 24-Piece Full Set (12 Intake, 12 Exhaust)
- Material: 21-4N Martensitic & Austenitic Stainless Steel
- Intake Dimensions: Head: 1.870″ | OAL: 8.503″ | Tip: .4669″
- Exhaust Dimensions: Head: 1.790″ | OAL: 8.810″ | Tip: .7579″
- Stem Diameter: .3789″
- Groove Style: Single Groove
- Engine Compatibility: Cummins ISX / QSX Platforms
💡 Machinist’s Pro Tip
Don’t put premium valves into worn-out guides. Always check your guide tolerances during assembly. To achieve “Top Dollar” performance, ensure your cylinder head preparation matches the elite quality of this 21-4N stainless steel kit. 🏎️
📦 Order Information & Warranty
- Fast Fulfillment: We ship rapidly because a downed truck is a loss. Get your fleet back on the road with precision-engineered parts.
- The Guarantee: Includes 90 Days of protection against manufacturing defects.
- Expert Support: Talk to real machinists who know how to build a head. For assistance, call the line: 727-609-1700.
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