Introducing the New Pair 6.4L Ford Powerstroke Cylinder Heads With Performance Valves and Springs Plus Performance Valves and Springs, designed to deliver unmatched reliability and performance for your heavy-duty diesel engine. These high-quality cylinder heads are engineered to meet or exceed OEM standards, providing a perfect replacement for worn or damaged parts. Preloaded with valves and springs, they ensure a smooth installation and optimal engine operation, making them the ideal solution for restoring your 6.4L Ford Powerstroke engine.
Each valve is crafted from premium-grade austenitic stainless steel, with EV8 material used for the intake and EV16 for the exhaust. The mid-stem is welded using high-grade chromium steel (HNV3) for enhanced strength.
Fully machined and treated with an all-over nitride process, these valves offer exceptional durability and friction wear resistance. Each valve is then polished, and the valve tips are hardened to a minimum of 50 HRc for increased durability.
Key Features:
- Premium austenitic stainless steel used for both intake and exhaust valves.
- Chromium steel stem material (HNV3) for superior strength.
- Fully machined with a specialized nitride treatment, adding wear resistance and hardness.
- Polished stem improves wear resistance and enhances the seal between the valve stem and stem seal.
- Polished top reduces carbon buildup for cleaner operation.
- Mid-stem weld ensures better durability compared to wafer tip designs.
- Nitride-treated seat face for added hardness and wear resistance.
- Smooth black nitride finish offers a sleek, durable appearance.
This combination of advanced materials and processes ensures long-lasting performance, improved durability, and efficient operation in demanding environments.
The spring has a closed pressure of 84 pounds at a compressed height of 1.880 inches, with an open pressure of 230 pounds at a compressed height of 1.440 inches. It features a solid height of 1.390 inches, an inner diameter (I.D.) of 0.655 inches, and an outer diameter (O.D.) of 0.994 inches. The total length of the spring is 2.134 inches, and it is composed of SWOSC-V material. It has 8.21 coils with a right-hand turn direction and a wire diameter of 0.169 inches.
Key Features:
- Precision-engineered cylinder heads for 6.4L Ford Powerstroke engines
- Fully loaded with valves and springs for easy installation
- Superior resistance to bending, wear, and heat
- Ideal for heavy-duty trucks and performance applications
Upgrade your engine today with this comprehensive package of cylinder heads and performance valves and springs, designed for durability, reliability, and enhanced performance. Whether you’re working your truck hard or just want to ensure long-lasting engine health, this combination provides the ultimate support for your Ford Powerstroke engine.
6.4L Ford Powerstroke Cylinder Heads Plus Performance Valvetrain
Core Return Required
Heavy Duty Parts Company – Core Returns Policy
Effective December 17, 2025
At Heavy Duty Parts Company, core returns are essential to our ability to provide high-quality, cost-effective cylinder heads. Returned cores supply critical components—such as keepers, springs, and retainers—that are vital to proper engine performance and allow us to maintain OEM-level quality.
No Upfront Core Charge
Unlike many suppliers, we do not charge a core fee upfront. Instead, we rely on customers to return their used cores within the required timeframe.
Core Return Requirements
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Cores are due within 30 days of the purchase date
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If a core is not returned within 60 days, the product warranty is void
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Unreturned cores will be charged as follows:
Customers needing additional time may contact us to request an extension. Approved extensions will prevent core charges from being applied.
Core Return Process
Cylinder heads are shipped with prepaid core return labels included in packets attached to the outside of each box. If labels are missing, customers should contact us for replacements prior to returning the core.
Core Eligibility
Some cylinder heads do not require a core return. In certain cases, core requirements may be waived at our discretion.
Why Core Returns Matter
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Reused core components help maintain OEM-quality standards
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Core returns allow us to keep pricing competitive
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Recycling cores supports sustainability by reducing waste and conserving resources
This policy applies to all purchases made on or after December 17, 2025.
Send Back All Components
To ensure the quality and integrity of our remanufacturing process, we ask that you return all components that were originally included with your new cylinder head. This includes items such as:
- Rocker arms
- Camshafts (if applicable)
- Any other hardware that came with your purchase
Easy & Free Core Return Process
- Each purchase includes a prepaid core return label in a plastic sleeve on the box.
- Simply pack your core with all included components, attach the label, and drop it off with the carrier—no extra cost to you.
- Returned cores undergo inspection and recycling, ensuring maximum efficiency.
Customer Partnership & Sustainability
By returning your core and its components, you help maintain a reliable supply chain, ensuring we can continue offering top-quality products at the best prices. This process not only benefits your wallet but also contributes to a greener and more efficient automotive industry.
We appreciate your support in keeping our business and the industry running smoothly!
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6.4 Ford Powerstroke
