HSP Diesel Billet Valve Covers for 2004.5-2010 Chevrolet And GMC LLY / LBZ / LMM Duramax
This product is vehicle-specific. Select your year, make, model, engine and transmission to confirm compatibility before adding it to your cart.
Colours and prices as published by HSP Diesel · verified 9/8/2026
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- Ships from HSP Diesel
HSP Billet Valve Covers for 2004.5–2010 Chevrolet / GMC Duramax Trucks The 046-HSP or HSP Billet Valve Covers are designed for the 2004.5–2010 Chevrolet and GMC Duramax-equipped trucks. These valve covers are perfect for both performance and street-driven trucks. If you want to enhance your engine bay's appearance, these are exactly what you need. Why Choose HSP Billet Valve Covers? Factory valve covers are plain and uninspiring. Duramax engines have a clean, open appearance”making them ideal for billet upgrades. HSP Diesel provides a visually striking, functional alternative to stock covers. Features of the HSP Billet Valve Covers Material: CNC-machined from billet 6061 T6 aluminum for lasting strength and precision fit. Finish Options: Choose from factory or custom powder coat colors to match your build. Breather System Compatibility: Optional breather routing kit available for enhanced crankcase ventilation. What's Included 1x LLY-LMM Billet Valve Cover Passenger Side (HSP-IN-1001) 1x LLY-LMM Billet Valve Cover Driver Side (HSP-IN-1002) 4x M4-0.7 x 6mm Socket Cap Screw (RFB-093-RFAB) 2x Small HSP Logo (RFB-752-F-RFAB) 28x M6 x 1.0 x 16mm Socket Cap Bolts (RFB-206-RFAB) Vehicle Compatibility LLY: 2004.5–2005 (VIN Code 2) LBZ: 2006–2007 (VIN Code 2 or D) LMM: 2007.5–2010 (VIN Code 6)
Note:
The engine code is represented by the 8th character of the VIN number. The 10th character designates the model year. Special Notes and Recommendations It is recommended to use these valve covers with HSP’s forward-facing thermostat housing. These covers do not include provisions for factory hardware mounts. Valve covers are no longer supplied with O-rings; use grey RTV to ensure a proper seal. Product Overview 6061 T6 Billet Aluminum Construction CNC-Machined for Perfect Fitment O-Ring Seal 7/8-14 Port All-New Hardware Included Optional Crankcase Vent Kit Powder Coat Finishes Available Clean, Low-Profile Design Our Warranty HSP "No BS" Limited Lifetime Warranty At HSP, we believe in our products and stand firmly behind every single one that leaves our facility. For years, we’ve gone above and beyond for our customers”even without an official policy. That commitment hasn’t changed. Now, it’s written in stone through our No BS Warranty. For more information about our Lifetime, No BS Warranty, click HERE.
HSP Billet Valve Covers for 2004.5–2010 Chevrolet / GMC Duramax Trucks The 046-HSP or HSP Billet Valve Covers are designed for the 2004.5–2010 Chevrolet and GMC Duramax-equipped trucks. These valve covers are perfect for both performance and street-driven trucks. If you want to enhance your engine bay's appearance, these are exactly what you need. Why Choose HSP Billet Valve Covers? Factory valve covers are plain and uninspiring. Duramax engines have a clean, open appearance”making them ideal for billet upgrades. HSP Diesel provides a visually striking, functional alternative to stock covers. Features of the HSP Billet Valve Covers Material: CNC-machined from billet 6061 T6 aluminum for lasting strength and precision fit. Finish Options: Choose from factory or custom powder coat colors to match your build. Breather System Compatibility: Optional breather routing kit available for enhanced crankcase ventilation. What's Included 1x LLY-LMM Billet Valve Cover Passenger Side (HSP-IN-1001) 1x LLY-LMM Billet Valve Cover Driver Side (HSP-IN-1002) 4x M4-0.7 x 6mm Socket Cap Screw (RFB-093-RFAB) 2x Small HSP Logo (RFB-752-F-RFAB) 28x M6 x 1.0 x 16mm Socket Cap Bolts (RFB-206-RFAB) Vehicle Compatibility LLY: 2004.5–2005 (VIN Code 2) LBZ: 2006–2007 (VIN Code 2 or D) LMM: 2007.5–2010 (VIN Code 6)
Note:
The engine code is represented by the 8th character of the VIN number. The 10th character designates the model year. Special Notes and Recommendations It is recommended to use these valve covers with HSP’s forward-facing thermostat housing. These covers do not include provisions for factory hardware mounts. Valve covers are no longer supplied with O-rings; use grey RTV to ensure a proper seal. Product Overview 6061 T6 Billet Aluminum Construction CNC-Machined for Perfect Fitment O-Ring Seal 7/8-14 Port All-New Hardware Included Optional Crankcase Vent Kit Powder Coat Finishes Available Clean, Low-Profile Design Our Warranty HSP "No BS" Limited Lifetime Warranty At HSP, we believe in our products and stand firmly behind every single one that leaves our facility. For years, we’ve gone above and beyond for our customers”even without an official policy. That commitment hasn’t changed. Now, it’s written in stone through our No BS Warranty. For more information about our Lifetime, No BS Warranty, click HERE.
HSP offers a limited lifetime warranty to the original purchaser on eligible HSP products. Underhood powder coating has separate two-year limited coverage. Non-HSP brands follow their own manufacturer warranties. Discontinued products and customer/installer damage are excluded. Claim authorization is required; customer pays inbound shipping for ordinary claims.
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
HSP Diesel warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
Professional installation is recommended.
- Return eligibility
- HSP states returns must be postmarked within 30 days of purchase, new and unused with original tags and packaging, with an approved RMA. A 15% restocking fee and customer-paid return shipping apply. Special orders, non-HSP dropship products, apparel, used items and custom colors are excluded. Based on what HSP Diesel offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- HSP Diesel
- Warranty duration
- Product-specific duration not stated; see supplier terms
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–10 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- HSP Diesel
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.