Description

Overview

The Keating Machine 12 Valve Billet Tappet Cover – Black Anodized is a premium upgrade for 1989–2002 Cummins 5.9L engines. Designed for durability, sealing reliability, and improved oil control, this billet tappet cover replaces the factory stamped-steel unit with a significantly stronger and more precise solution. As a result, it eliminates the flex and oil seepage issues that commonly develop with OEM covers over time.

Billet Construction & Black Anodized Finish

Keating Machine CNC-machines this tappet cover from high-quality billet aluminum to ensure consistent wall thickness and long-term structural integrity. In addition, the black anodized finish improves corrosion resistance while delivering a clean, performance-focused appearance. This finish works well for daily-driven trucks, performance builds, and show-quality engine bays.

Improved Oil Control & Internal Baffling

Unlike factory tappet covers, this billet design incorporates internal baffling to improve crankcase oil control. Consequently, it helps reduce oil vapor movement during high-RPM operation or under sustained boost. This design supports a more stable crankcase environment, which contributes to cleaner engine operation and improved long-term reliability.

Increased Internal Clearance

The tappet cover features increased internal clearance to support upgraded valvetrain components. Therefore, it accommodates performance roller rockers and upgraded tappets that often cause fitment issues with stock covers. This makes it a strong choice for performance engines, towing setups, and modified Cummins builds.

O-Ring Sealing System

Instead of relying on traditional paper gaskets, this cover uses a precision-machined O-ring block seal. As a result, it delivers a gasket-free installation that simplifies service and minimizes oil leaks. The O-ring design maintains consistent sealing even when exposed to heat cycles, vibration, and heavy engine load.

Fitment & Installation

This tappet cover installs as a direct bolt-on upgrade and includes stainless steel mounting hardware for corrosion resistance and long-term serviceability. It fits 1989–2002 Cummins 5.9L engines and works with 12-valve configurations as well as early P-pump–style 24-valve setups. No modification is required, which makes installation straightforward for both professional shops and experienced DIY builders.