Glvvexa Gen 4 LS Valley Cover Plate Kit for 2007–2013 Chevy Silverado & GMC Sierra — Aluminum Direct-Fit, Includes Gasket & O-Ring

Glvvexa 12598832 valley cover plate kit is a direct-fit aluminum replacement designed to restore sealing and ventilation on Gen 4 LS V8 engines from 2007–2013 (4.8L, 5.3L, 6.0L, 6.2L) without AFM/DOD systems.

If your Chevy Silverado or GMC Sierra is showing oil leaks, elevated crankcase pressure, or other symptoms tied to a damaged valley cover, this kit provides the machined aluminum plate, gasket, O-rings and hardware to return the engine’s valley area to proper sealing. Manufactured for Gen IV LS platforms including LS2, LS3, LS7 and L92 family engines, the Glvvexa kit replaces OE part number 12598832 and is finished with sandblasted and painted surfaces for improved corrosion resistance and a refined appearance under the intake manifold.

How does this replace the factory valley cover on my Gen 4 LS engine?

The Glvvexa kit is a direct-replacement component engineered to match the original mounting points and sealing surfaces of GM part 12598832. It includes the aluminum valley cover, a shaped aluminum gasket, eight O-rings and eleven bolts so you have everything needed for installation.

• Direct-fit for 2007–2013 Gen 4 LS V8 engines (4.8L–6.2L) without AFM/DOD
• Includes all gaskets, O-rings and bolts required for a single installation
• Machined mating faces to match factory intake and valley geometry

What benefits does the aluminum, sandblasted finish provide?

The valley cover’s aluminum construction improves durability versus some stock plastic or composite pieces and resists warping at engine temperatures. The sandblasted and painted surface helps prevent corrosion, reduces surface wear, and leaves a consistent look beneath the intake manifold.

• Lightweight, heat-tolerant aluminum resists distortion
• Surface treatment improves longevity and visual consistency
• Painted finish adds a protective barrier against contaminants

Will this kit fix oil consumption or crankcase pressure problems?

Replacing a cracked or failing valley cover and worn seals can alleviate common causes of oil leaks and crankcase ventilation issues, but it addresses only problems originating from the valley cover area. Always inspect PCV components, gaskets, and related seals during replacement to isolate the root cause.

• Replaces worn or damaged sealing surfaces that cause leaks
• Included O-rings and gasket restore reliable sealing
• Recommended to check PCV valves and intake gasket condition as well

How straightforward is installation for a home mechanic?

Installation is typically moderate in difficulty and requires removal of the intake manifold or partial disassembly depending on vehicle layout. Because the kit includes the needed fasteners and seals, a competent DIYer with the appropriate tools can complete the job; professional installation is recommended if you lack experience.

• Kit contains valley cover plate, aluminum gasket, 8 O-rings and 11 bolts
• Expect intake removal in many applications—allow several hours
• Follow torque specs and sealing procedures for reliable results

Who this kit is for: The Glvvexa 12598832 valley cover plate kit is aimed at owners of 2007–2013 Chevrolet Silverado and GMC Sierra trucks (and other vehicles using Gen 4 LS2/LS3/LS7/L92 engines) who need a durable, direct-fit replacement for a damaged or leaking valley cover. It's ideal for DIY mechanics, restoration projects, or anyone replacing aging factory valley components to reduce leaks and restore proper crankcase sealing. If your engine uses AFM (Active Fuel Management) / DOD systems, confirm compatibility before purchasing.