KM 12 Valve Billet Valve Cover fits Cummins Notched for Stock Lines (123012-1N) for 1989-1998 Cummins 5.9L

Billet Aluminum Valve Cover for Cummins 12 Valve Engines

The Keating Machine 12 Valve Billet Aluminum Valve Cover is a premium upgrade for 1989–1998 Cummins 5.9L 12-valve engines. Keating Machine CNC-machines this cover from high-strength billet aluminum to replace the factory stamped steel valve cover with a stronger, more reliable solution designed for long-term durability.

Unlike OEM valve covers that flex and rely on traditional gaskets, this billet aluminum valve cover uses a precision-machined O-ring sealing system. As a result, it maintains consistent sealing pressure through heat cycles, vibration, and boost. This design significantly reduces the oil seepage and gasket failures commonly seen on factory covers.

This version features a precision-machined notch that provides full clearance for factory injection lines. Because of this, the cover installs cleanly on engines retaining stock fuel line routing without requiring cutting or modification. This makes it ideal for original restorations, daily-driven trucks, tow rigs, and work trucks that still rely on OEM fueling components.

The rigid billet construction resists warping over time and maintains proper fitment under demanding conditions. In addition, the smooth machined finish delivers a clean, professional appearance that enhances the engine bay without looking overbuilt. The cover retains compatibility with the factory breather system, allowing proper crankcase ventilation without additional modifications.

Keating Machine includes stainless steel mounting hardware to ensure a secure, corrosion-resistant installation. The valve cover bolts directly into place using factory mounting locations, making installation straightforward for both professional builders and DIY owners.

Whether you are refreshing a tired engine, improving leak prevention, or upgrading for long-term reliability, this billet aluminum valve cover provides a durable and proven solution for Cummins 12-valve engines.

Designed for Reliability, Fitment, and Long-Term Use

This notched billet aluminum valve cover supports stock injection lines while delivering improved sealing, strength, and engine bay refinement. It is a dependable upgrade for performance, towing, and restoration applications alike.