WCFab Billet Aluminum Upper Valve Cover sets fit LLY, LBZ, and LMM Duramax and are a great way to clean up your engine's appearance. Integrated o-ring seal replaces OEM gaskets and prevents the need for use of silicone sealers. Includes countersunk stainless steel fasteners and black anodized #10 JIC (-10AN) PCV fittings. Finished in raw aluminum ready for polishing or painting standard. Custom Color Powder Coat finishes available as an optional upgrade and carry additional lead time.We recommend pairing these with our Top Outlet Billet Thermostat Housing and Upper Coolant Pipe kits (or a forward facing thermostat setup) because these valve covers do not include brackets for the side mount routing of the OEM setup.. Wehrli Custom Fab Valve Cover Set, Billet Upper, for 2011-2016 Duramax LML, Raw Aluminum. Wehrli 11-16 Chevrolet 6.6L Duramax LML Billet Upper Valve Cover Set - Raw Aluminum. Valve Cover Set, Billet Upper, for 2011-2016 Duramax LML, Raw Aluminum. Valve Cover Set 11-16 Dmax LML Raw Alum. Black Anodized #10 JIC PCV Fittings. Left and Right Upper Valve Covers. Flush Head Stainless hardware. CNC Machined Billet Aluminum. Supersedes model: WCF100692. Engine Valve Cover Set. Raw Aluminum Finish. Vlv Cvrs 11-16 Raw. O-ring Seal. Made in USA

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