ONER AUTO PARTS Driver Side Valve Cover Kit for 1999–2008 GM V8s — Aluminum with Gasket & Bolts

ONER AUTO PARTS driver side valve cover kit is a complete replacement assembly (cover, gasket, bolts, sealant) engineered to fit 1999–2008 GM V8 applications and restore a reliable seal at the cylinder head.

This valve cover bundle replaces OE numbers 12570427 and 264-965 and is built from die-cast aluminum with a molded rubber gasket and matching fasteners. It arrives ready for installation with sealant included and is intended for a wide range of Chevy, GMC, Cadillac and related models equipped with 4.8L, 5.3L, 5.7L, 6.0L and 6.3L V8 engines. All units are inspected before shipping and come with a one-year support window.

Which vehicles will this valve cover fit?

This driver-side valve cover is compatible with many GM trucks, SUVs and performance cars produced between 1999 and 2010 that use the specified V8 engines. Verify your vehicle’s year, engine size and OE part number before ordering to ensure proper fitment.

• Replaces part numbers: 12570427, 264-965
• Common fits: Chevy Silverado (1500/2500/3500), Tahoe, Suburban, Avalanche, Trailblazer, Silverado HD
• Also fits: GMC Sierra/Yukon/Savana/Envoy, Cadillac Escalade/CTS, Chevy Corvette and other GM V8 models
• Engine families: 4.8L, 5.3L, 5.7L, 6.0L, 6.3L V8

What’s included and what condition is the part in?

The kit ships as a ready-to-install assembly: the aluminum valve cover, a pre-molded rubber gasket, a set of mounting bolts and a small tube of sealant. Each kit is brand new and inspected to meet quality expectations prior to dispatch.

• Valve cover: die-cast aluminum, finished for engine bay use
• Gasket: molded rubber, shaped for a consistent seal
• Bolts: matched fasteners for driver-side mounting locations
• Sealant: small tube included for any recommended contact points

How does installing this valve cover help with engine performance and maintenance?

A properly sealed valve cover prevents oil seepage around the cylinder head and keeps contaminants out of the valve train area. Replacing a cracked or warped cover and its gasket reduces oil loss, prevents oil burning on hot exhaust surfaces and supports consistent oil pressure and engine cleanliness.

• Stops oil leaks that can soil the engine bay and belts
• Reduces risk of burning oil odor and smoke from hot exhaust parts
• Maintains correct crankcase ventilation and cleaner valve train area

How difficult is installation and what should I prepare?

Installation is straightforward for anyone with basic mechanical skills and common hand tools; expect to remove the old cover, clean the mating surface, apply sealant where specified and torque the bolts to OEM specs. If you’re unsure about torque values or routing of PCV lines, consult a service manual or a professional mechanic.

• Tools: socket set, torque wrench, gasket scraper, brake cleaner
• Time: typically 1–2 hours for experienced DIYers
• Tip: clean mating surface thoroughly before installing new gasket

Who is this for: This ONER AUTO PARTS valve cover kit is aimed at owners and mechanics working on late-1990s to late-2000s GM V8 vehicles who need a reliable, OEM-form replacement for a leaking or damaged driver-side cover. It’s suitable for fleet maintenance, restoration projects, and routine repairs where an affordable, properly fitting aluminum valve cover with gasket and hardware is required. Always confirm fit with your vehicle details and part numbers before purchase.