GM LS Rocker Arms Set with Upgraded Trunion Bearings InstalledOur high quality steel alloy LS rocker arms feature caged roller bearings and 8620 steel trunions for superior durability and performance over the stock units. Engineered to handle higher spring pressures and high engine RPM’s. 100% drop-in design that meets or exceeds OEM specifications for a hassle free installation. The caged roller bearings greatly reduce the possibility of the bearing failure experienced with stock LS1 needle bearings, which can send loose needles throughout the engine upon failure. Specs: Fits: LS1/LS2/LS6/ LR4 Vortec 5300 LM7 L59 LM4 L33 LQ4 LQ9 – 4.8L, 5.3L, 5.7L, & 6.0L Engines Straight Intake Rocker 100% Drop-In Design With Upgraded Bearings and Trunions Fully Caged Roller Bearings 8620 Steel Alloy Trunion 1.7 Rocker Ratio Kit includes:16 LS Series Rocker Arms with Roller Bearing Trunnion Upgrade Installed16 bolts for LS Rocker Arms