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USD 325 325 375
Part #:

HSP LML Billet Valve Covers

2011-2016 GM 6.6L Duramax LML
Part #:
FROM 325

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Upgrade the valve covers in your 2011-2016 GM 6.6L Duramax LML with the HSP LML Billet Valve Covers. Designed to give your engine a dressed up look, the HSP Valve Covers are built from 6061-T6 aluminum and are available in multiple colors to match your truck. HSP Billet Valve Covers feature an o-ring seal to eliminate the need for silicone. It's recommended to run these valve covers with their forward facing thermostat housing as there are no provisions to mount the factory hardware to the upper valve cover. 1/2" center port for optimized crankcase ventilation. 

  • O-Ring Seal 
  • 1/2" Center Port
  • CNC Billet Machined
  • 6061 T6 Aluminum Construction
Application Notes:
Breather re-routing required for installation.
Crank case ventilation kit sold separately (see related items).
Forward facing thermostat housing recommended. 

Product Options

546-HSP-RAW Raw
546-HSP-BR Blood Red
546-HSP-CB Candy Blue
546-HSP-CP Candy Purple
546-HSP-CR Candy Red
546-HSP-DG Dark Grey
546-HSP-GB Gloss Black
546-HSP-O Orange
546-HSP-SB Satin Black
546-HSP-W White


  • Manufacturer Name HSP
  • Shipping Weight 15.00 lb.
  • Shipping Length 24 in.
  • Shipping Width 16 in.
  • Shipping Height 10 in.
  • Fuel Type Diesel
  • Warranty Yes
  • Warranty Info Limited Lifetime
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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XDP continues to closely monitor the COVID-19 (Coronavirus) outbreak. As an integral part of the automotive supply chain, at this point all call centers and distribution centers remain fully operational to ensure we keep vital service components flowing to vehicles used in transport of goods and emergency response. To ensure the health of our employees, families, and customers, we have made the following procedural changes:

  • UPDATE: Effective 6/1 Customer Service resumes normal business hours of M-F 8:30 – 9:00pm EST.
  • Effective 3/18 we have decided to temporarily close both of our retail stores in NJ and NV.
  • Our technical sales team remains available Mon-Fri 8:30am-9pm and Saturday 10:30am-7pm EST.
  • All employees have been encouraged to follow the CDC's recommendations at home and in the workplace.
The circumstances of this virus are fast moving, as such, we will continue to update you with any further operational adjustments as needed. As always, we value your business and appreciate your patience as we manage this situation together.
Emissions Notice

This product is not legal for sale or street use in California. Certain aftermarket products are subject to governmental emission standards regulated by the California Air Resources Board. In order for these products to be legal on a specific vehicle in California, the part number must receive a CARB Executive Order (EO) number. This number makes the part legal for use only on specific years, makes and models of vehicles. A decal with CARB EO number for these parts must be displayed in the engine bay to satisfy smog inspection requirements.