Fleece Factory LML Duramax Cylinder Head, Driver | 2011-2016 Silverado/Sierra 2500/3500

Fleece Factory LML Duramax Cylinder Head – Driver Side | 2011-2016 Silverado/Sierra 2500/3500

Built for performance, reliability, and OEM fitment, the Fleece Freedom Series driver-side cylinder head is the ideal choice for your 6.6 L LML Duramax rebuild or top-end refresh. Machined and assembled at Fleece’s Freedom Racing Engine facility, each unit is pressure and leak tested, precision machined, and fully assembled with all-new components-no core required.

Key Features

• New valve guides, seals, and springs pre-installed for a ready-to-run assembly.
• Precision-ground stock-style valves with a 45° seat and multi-angle valve job for factory-like flow.
• Pressure & leak tested for guaranteed integrity at operating temps and pressures.
• No core charge-you keep your original head, no return required.
• Made in the USA and backed by Fleece’s 1-year limited parts warranty.

What’s Included

• Fully assembled driver-side cylinder head (ready to install)
• Factory-style injector cups installed
• Machined deck surface and valve seats
• Installation guide

Vehicle Fitment

Fits all 2011-2016 Chevrolet Silverado and GMC Sierra 2500/3500 HD 6.6 L LML Duramax engines, including trims like WT, LT, LTZ, High Country, SLE, SLT, and Denali. Works with both 2WD and 4WD configurations.

Technical Specs

Recommended Companion Parts

• FPE-61-10004-P – Passenger-Side Freedom Series Cylinder Head for a matched pair.
• GM 12637785 – Grade C MLS Head Gasket (Driver Side).
• ARP 230-4201 – ARP 2000 Head Stud Kit for increased clamping force and long-term durability.
• FPE-34563 / FPE-34564 – PowerFlo In-Tank Lift Pumps for improved fuel delivery during top-end rebuilds (short-bed / long-bed).

Installation Notes

Always verify engine block deck surface for flatness before installation. Use new Grade C MLS head gaskets and ARP head studs for best results. Follow factory torque spec and sequence if reusing OEM bolts.