In contrast to the full arc roller tip rocker arm, the GM LS 1.7 ratio rocker arm is designed to start at the inboard edge of the valve tip then rolls and slides across the valve tip during lift ...

In this video David Freiburger and company perform a series of tests to find out if upgrading the stock-type stamped-steel rockers in an LS V8 yields any gains.

If you're planning on higher than stock rpm or making more than 500 hp, consider the Comp Cams' Rocker Arm Trunnion Upgrade Installation Kit for the LS1/2/3/6/7 (PN 13702-KIT) as part of your LS ...

Roller refers to the roller bearings used on the rocker arm trunnion to reduce friction and increase high-rpm durability and horsepower. In stock applications, the factory LS rocker bearing does ...

The stock LS rocker is well designed but can suffer from failed trunnion bearings after 150,000 hard road miles. The Summit trunnion upgrade kit uses a stronger steel trunnion and better bearings.