Fleece FPE-61-10014-D Freedom Series Duramax Cylinder Head (Driver Side) | 2017-2023 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax

Features:

• Fits 2017–2023 GM 6.6L L5P Duramax
• Re-manufactured OE casting for precise fit
• Equipped with new valves and guides
• Includes new springs and valve seals
• Pressure and leak tested for reliability
• Multi-angle valve job improves performance
• Perfect for daily driving or towing
• No core charge required at purchase
• Manufactured in Freedom Racing Engine shop
• Backed by 1-year limited parts warranty

Give Your Duramax The Strength It Deserves

If your L5P Duramax has been showing signs of wear, from rough idling to low power, upgrading to a Fleece Freedom Series Cylinder Head is one of the smartest moves you can make. This head is built with everyday durability in mind, making it just as reliable for the daily driver as it is for the weekend tow rig. Fleece sets the bar high by manufacturing each head in their advanced Freedom Racing Engine shop, where every piece is carefully inspected before it leaves the door. The end result is a product that doesn’t just restore lost performance but also adds the peace of mind that comes with knowing your engine is backed by quality. Equipped with brand new valves, guides, springs, and seals, this cylinder head is designed to keep your truck running smooth and strong for years to come. There is no core charge to worry about, which means you are getting a fresh start right out of the box. Whether you’re pulling a trailer through the mountains or commuting during the week, this head delivers the reliability you need without compromise.

Built With Precision To Exceed Factory Standards

Fleece designed the Freedom Series Cylinder Head for the 2017–2023 L5P Duramax to meet or surpass OEM expectations in every way. Constructed from a re-manufactured OE casting, the head undergoes a meticulous process that includes pressure and leak testing to guarantee long-term dependability. Each unit receives a multi-angle valve job, helping optimize airflow and combustion for better efficiency and cleaner performance under load. Fresh hardware is already installed, including valves, valve guides, springs, and seals, giving you a complete and ready-to-run package. The use of heat-treated components and precise machining ensures the head is capable of handling the stress that comes with towing, hauling, or tuned setups. Installation is straightforward for experienced diesel technicians, and Fleece recommends pairing it with the GM Grade C head gasket to ensure the best seal. Backed by a one-year limited warranty, this cylinder head brings both the engineering detail and tested strength your Duramax needs to stay at peak performance.

Fitment: 2017, 2018, 2019, 2020, 2021, 2022, 2023 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax

Notes:

• Fits 2017–2023 Silverado and Sierra 2500HD/3500HD 6.6L L5P Duramax.
• Direct replacement driver side cylinder head, confirm side before ordering.
• Manufactured in Fleece’s Freedom Racing Engine shop for quality control.
• Built from re-manufactured OE casting to match factory specs.
• Comes with new valves, guides, springs, and seals already installed.
• Each head is pressure and leak tested for reliability.
• Multi-angle valve job improves airflow and performance consistency.
• No core charge required, you keep your old head.
• Recommended to use GM Grade C head gasket (12727486).
• Best installed by an experienced diesel technician for proper fitment.
• Backed by a one-year limited parts warranty.

Install Instructions