CHE Precision CHE4290 Rocker Arm Trunnion Upgrade Kit for Chevrolet LS LT EnginesBy using state of the art CNC machining equipment, CHE can manufacture components efficiently and repeatedly with unparalleled accuracy. You can be sure yo u will get a CHE PRECISION part manufactured here in the USA! Materials CHE uses the finest materials available today. With 30 years of industry experience, CHE has developed its own proprietary material that has revolutionized the industry by setting a new standard for wear and performance.