Product Description
Michigan Motorsports Gen 4 LS Valley Cover – Non-AFM/DOD – Replaces GM 12598832
Fits 4.8L 5.3L 6.0L 6.2L Gen 4 LS Engines – Without PCV Provision
The Michigan Motorsports Gen 4 LS “L92” Style Valley Cover is a high-quality replacement for the popular GM 12598832 valley cover, offering the same functionality without the inflated OEM pricing. Designed specifically for Gen 4 LS engine blocks, this non-AFM/DOD valley cover is the correct solution when performing a DOD/AFM conversion or when servicing engines that were factory-equipped without AFM.
This cover eliminates the PCV provision found on certain factory AFM applications and includes integrated oil tower seals to properly block off AFM oil passages—just like GM did on factory non-AFM engines. No need to plug the block separately. Everything required for a proper install is included.
Kit Includes
- Valley Cover (Non-AFM/DOD Style)
- Valley Cover Gasket
- Integrated Oil Tower Seals
- Mounting Bolts
Key Features & Benefits
- Correct Non-AFM/DOD Configuration: Designed for Gen 4 LS engines running conventional lifters, making it the proper cover for DOD/AFM conversion builds and factory non-AFM applications.
- Integrated Oil Tower Sealing: Built-in oil tower seals block AFM oil passages just like factory non-DOD engines, eliminating the need for separate oil tower plugs.
- No PCV Provision: Ideal for performance builds or simplified crankcase routing; engines originally using a valley-mounted PCV can be re-routed to an unused valve cover port.
- Cost-Effective GM Replacement: Direct replacement for GM 12598832 without the premium OEM price tag, while maintaining proper fit and sealing.
- Complete Installation Kit: Includes gasket and bolts so you are not reusing old hardware during your cam swap or AFM conversion.
Engine Compatibility
Fits the following engines when used with conventional (Non-DOD/AFM) lifters:
- LS2, LS3, L99, L92, L9H, L94, L76, L77, LY6, L96, LY5, LMG, LMF, LH6, LC9, LY2, L20, LH8, LH9.
Important Notes
This cover cannot be used with oil tower plugs that sit above the deck surface, as they will interfere with the cover. The integrated oil tower seals are designed to properly seal the DOD oil passages the same way GM sealed factory non-DOD engines.
