Direct Bolt-On Chevrolet Gen IV - LS-Series 1.70 Roller Tip Rocker Arms These roller rocker kits are a direct bolt-on for the OE rocker arms on most GM Gen III engines. No need to changing of pushrods, guide plates or rocker studs. No need for valve cover spacers. They feature needle bearing fulcrums and roller tips, centerless ground trunnions, centerless ground pins and rollers. Purple anodized for additional protection. Available with stock 1.70 ratio or high lift 1.80. Lifetime Warranty to the original purchaser (with proof of purchase)! Made in the USA.