Fleece Freedom Series Cylinder Head – Drivers Side (FPE-61-10003-D) for 2006-2010 Duramax LBZ / LMM

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The Fleece Freedom Series Cylinder Head – Driver’s Side (FPE-61-10003-D) is a high-quality replacement for 2006–2010 GM Duramax LBZ and LMM engines. Made in the USA, it offers improved airflow for better engine efficiency and power. Fully assembled with new components, it provides a ready-to-install, durable solution suited for both stock and performance applications, making it a reliable upgrade for Duramax owners.

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Description

The Fleece Freedom Series Cylinder Head – Driver’s Side (FPE-61-10003-D) is a premium replacement component designed specifically for 2006–2010 GM Duramax LBZ and LMM engines. Engineered for superior performance and durability, this cylinder head is meticulously cast, machined, and assembled in the USA to meet or exceed factory specifications. It features improved port designs for optimized airflow, which can contribute to better engine efficiency and power output. Each head comes fully assembled with new valves, valve seals, valve springs, and hardened seats, ensuring a ready-to-install solution that saves time and guarantees reliability. Ideal for both stock and performance applications, the Fleece Freedom Series Cylinder Head is a trusted upgrade for Duramax owners seeking enhanced engine longevity and performance.

Additional information
Weight 45 lbs
Dimensions 23 × 15 × 12 in
Fitment

Fitment

  • 2006 GM Silverado/Sierra 2500/3500 6.6L LLY/LBZ Duramax
  • 2007 GM Silverado/Sierra 2500/3500 6.6L LLY/LBZ Duramax (classic body style)
  • 2007.5 GM Silverado/Sierra 2500/3500 6.6L LMM Duramax (new body style)
  • 2008 GM Silverado/Sierra 2500/3500 6.6L LMM Duramax
  • 2009 GM Silverado/Sierra 2500/3500 6.6L LMM Duramax
  • 2010 GM Silverado/Sierra 2500/3500 6.6L LMM Duramax
Features

Features

  • New casting
  • New valve guides, new springs, and new valve seals
  • Pressure and leak tested
  • Precision ground stock valves with a 45 degree angle
  • Multi-angle valve job
Installation

Installation

Installation Instructions

Installation Video

Installation Notes

  • We recommend using GM 12637788 head gasket (Grade C, Right) and GM 12637785 head gasket (Grade C, Left)
About brand
Fleece Performance Engineering is a diesel performance manufacturer focused on reliability and precision engineering. The company designs parts that solve common diesel issues while supporting added power. Fleece products support daily driving, towing, and performance diesel trucks. Fleece engineers fuel system components, turbochargers, electronics, and emissions-compliant upgrades in house. Their parts improve efficiency, drivability, and long-term engine protection. Each product is tested for proper fit and consistent performance. Diesel owners trust Fleece for dependable upgrades. Whether maintaining a work truck or building for performance, Fleece delivers proven solutions designed for real-world use.
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