HSP Billet Valve Covers (LLY/LBZ/LMM/LML)

Part# Raw

$337.25 Includes Free Shipping.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.Ca.Gov

HSP Billet Valve Covers

Fits 2004.5-2016 LLY-LBZ-LMM-LML Duramax Engine

Part# 046-HSP-X / 546-HSP-X

Please allow at least 40+ Business Days before shipment, as all HSP Products are special order.

HSP billet valve covers are designed to give your LLY, LBZ, LMM, and LML engine a clean and sleek look. They feature a 1/2" NPT port in the center of the cover to optimize crank case ventilation. Made from 6061 T6 Aluminum, and incorporate an o-ring to eliminate the need for messy silicone. It is recommended to run these valve covers with HSP's forward facing thermostat housing, for there are no provisions to mount the factory hardware to upper valve cover.

The additional crankcase ventilation kit will include all the necessary hardware to route the breathers behind the front cab mounts. This reroute will feature a 1/2" NPT to -10AN aluminum 90° fitting to a -10AN nylon braided hose on each valve cover. The crankcase ventilation kit is not included with the standard valve covers and can be purchased separately in the options menu.


  • This is a custom order part. Once the order has been processed it CANNOT be cancelled, returned, or refunded.