Availability

Rocker Arm Trunnion Upgrade Kits

Trunnion-mount rocker arms are stronger, stiffer, and lower-friction than traditional ball-and-stud rockers—they’re one of the many things that make GM’s...

Trunnion-mount rocker arms are stronger, stiffer, and lower-friction than traditional ball-and-stud rockers—they’re one of the many things that make GM’s LS engines a popular choice for high-performance builds. So, why would you want to install a rocker arm trunnion upgrade kit? Well, the factory setup isn’t bulletproof. Even on stock engines, it’s common to find needle bearing rollers in the oil pan. When you install an aggressive camshaft and stiffer valve springs, it only makes sense to consider replacing your rocker arm fulcrums, as well.

Fortunately, the experts at Summit Racing Equipment...

Trunnion-mount rocker arms are stronger, stiffer, and lower-friction than traditional ball-and-stud rockers—they’re one of the many things that make GM’s LS engines a popular choice for high-performance builds. So, why would you want to install a rocker arm trunnion upgrade kit? Well, the factory setup isn’t bulletproof. Even on stock engines, it’s common to find needle bearing rollers in the oil pan. When you install an aggressive camshaft and stiffer valve springs, it only makes sense to consider replacing your rocker arm fulcrums, as well.

Fortunately, the experts at Summit Racing Equipment have responded, offering rocker arm trunnion upgrade kits for Chevy’s Gen III/IV LS and Gen V LT engines, as well as the 5.9L 24-valve Cummins diesel. They’re easy to install, too; with the rocker arms removed and proper tools on-hand, you can perform the conversion in a couple of hours.

Kits are available in two different styles:

Needle Bearing

This is similar to the factory setup, but they feature captured rollers that can’t damage the engine, as well as higher-grade materials.

Bronze Bushing

These replace the needle bearings with high-performance bronze bushings for increased load-carrying capacity and peace of mind.

Which is right for your build? Needle bearings may create less friction, for greater power and efficiency. Bronze bushings have fewer parts to fail, and may perform better under heavy loads. Either one is an improvement over the stock parts, especially in a performance application. It really comes down to personal preference.

All trunnion kits include new bearings or bushings, retaining rings (except in Cummins applications), and trunnions. Kits may also include mounting bolts and a removal/installation tool —see item descriptions for more information.