Features: 100% brand new, suitable for aftermarket replacement, made of high quality material, can be used for a long time. Excellent material and tactile feeling, can meet your requirement. Easy installation and convenient to use, the process is simple. Interchange Part Number: 12569167, 10214664 Fitment on Vehicle: For Cadillac Escalade; For Chevy Avalanche 1500, Camaro, Corvette, Express 2500 3500, Silverado 1500 2500, Suburban 1500 2500, Tahoe, Trailblazer (EXT), Savana 1500 2500; For GMC Sierra 1500 2500, Sierra 2500, Yukon (XL); For Isuzu Ascender; For Pontiac Firebird. Fits all of these applications: For LS1/LS2/LS6/LR4 Vortec 5300 LM7 L59 LM4 L33 Engines ?C 4.8/5.3/5.7/6.0/ This kit includes: LS Series Rocker Arm Bolts for LS Trunnion Kit Install the upgrade rocker arms to the cylinder heads using the new socket head cap screws provided in the kit. Be sure to orient the trunnion so the recessed flat side of the trunnion center hole faces up (the socket head cap screw should rest against this recessed flat side of the hole). Tighten the cap screw to 22 ft-lbs following the OE installation procedure.