Michigan Motorsports LS Rocker Arm Trunnion Upgrade Kit — Fits LS1–LS6 4.8–6.0L, Caged Needle Bearings

Michigan Motorsports LS Rocker Arm Trunnion Upgrade Kit converts fragile OE rocker trunnion bearings to robust caged needle bearings for improved valvetrain stability and longevity.

If you run a GM LS engine—stock or modified—factory rocker arm trunnions can be a weak link under high loads, aggressive cams, or elevated RPMs. This complete upgrade kit replaces the original press-in bearings and trunnions with heavy-duty steel components and caged needle bearings engineered to resist wear and maintain alignment. The result is smoother rocker rotation, reduced risk of catastrophic bearing collapse, and a longer service life for your valvetrain parts without complex machining or custom parts.

How does this kit improve valvetrain durability?

The kit swaps the OE-style bearing surfaces for a caged needle bearing design that spreads loads more evenly and resists brinelling. Upgraded steel trunnions provide a stronger mounting surface and minimize deformation under high spring pressures or boost. Together, these changes cut down on wear at the rocker pivot and slow the progression of failure modes common to stock assemblies.

• Caged needle bearings reduce point loading and friction.
• High-strength steel trunnions resist bending and wear.
• Improved bearing clearance stability under thermal cycling.

Will this fit my LS1, LS3, LS6 or truck LS engine?

The product is engineered for broad compatibility across GM LS-family engines, covering common small- and big-block LS variants. It fits many factory rocker sets used in Camaro, Corvette, Silverado, Sierra and other LS-powered vehicles, so you can use it for both passenger cars and light trucks with those valve covers and rocker assemblies. Always cross-check vehicle application or part numbers to confirm fitment before purchase.

• Compatible with LS1, LS2, LS3, LS6 platforms and 4.8L–6.0L LS engines.
• Works with many OE-style rocker assemblies from GM.
• Check fitment chart or vehicle references for specific years/models.

How difficult is installation and what’s included?

The kit ships with everything needed to convert the rocker trunnions: upgraded trunnions, caged needle bearings, and installation hardware plus instructions. No special machine work or modifications are required for most applications; the install is a direct replacement using common shop tools. If you’re comfortable with disassembling rocker assemblies and following torque specs, this can be completed in a home garage or professional shop.

• Includes trunnions, caged needle bearings, and all hardware.
• Direct-fit replacement for many OE rocker assemblies—no machining in most cases.
• Detailed instructions reduce installation guesswork and downtime.

What performance differences should I expect after upgrading?

You should notice steadier rocker motion, especially under sustained high-RPM or high-load conditions, and reduced likelihood of sudden bearing failure. The conversion can contribute to more consistent valve timing and valvetrain geometry over time, which indirectly supports reliable power delivery and component life. This is an upgrade for durability and consistency rather than an instant power gain.

• Reduced risk of trunnion bearing collapse under stress.
• More consistent valve actuation at high RPMs.
• Enhanced longevity of rocker and pushrod interfaces.

Who is this for: The Michigan Motorsports LS Rocker Arm Trunnion Upgrade Kit is aimed at enthusiasts and builders who want a no-nonsense durability upgrade for GM LS engines. It’s ideal for performance street cars, race builds, forced-induction projects, and anyone swapping to aggressive camshafts or running elevated spring pressures. If you’re preparing an LS platform for sustained high-RPM operation or want to eliminate a known failure point without complex machining, this kit provides a reliable, direct-fit solution that reduces maintenance risk and extends valvetrain life.