Wehrli 04.5-10 Duramax LLY/LBZ/LMM Billet Upper Valve Cover Set - Raw Aluminum

When you're under the hood of your 2004-2010 Duramax truck, like a Silverado 2500 HD or GMC Sierra 3500, and you want to give the engine bay a cleaner, more finished look, this billet upper valve cover set from Wehrli Custom Fabrication is a solid option. These aren't just covers; they're CNC machined from solid billet aluminum, giving your engine a strong, custom appearance that stands out from stock.

What you get in this set are the left and right upper valve covers, ready for your personal touch with their raw aluminum finish – perfect for polishing or custom painting. They replace the factory gaskets with an integrated o-ring seal, which means you won't need to mess with silicone sealers during installation. The set also includes flush-head stainless steel fasteners for a clean look and black anodized -10AN PCV fittings. Because these valve covers don't have the factory mounting points for the side-routed OEM coolant lines, Wehrli recommends pairing them with their top-outlet thermostat housing and upper coolant pipe kits, or any setup that moves the thermostat to a forward-facing position.