Hi-Tech? Stainless Steel Rocker Arms are the toughest rockers in racing, and that's why they're the choice of professionals. They are engineered to minimize reciprocating weight - meaning more rpm and longer valve train life, as well as race-winning durability. Available in ratios to suit every camshaft profile, these rockers are an investment that pas big dividends in performance and dependability. Made from 15-5PH stainless steel, a premium allow that is high in nickel and chromiumRigidity tested at 52, 000 pounds/inch and proven to resist power-robbing deflectionExtra large trunions and more needle bearings to spread out the load and reduce wear and increase durabilityPit Stop USA offers Comp Cams Hi-Tech™ Stainless Steel Rocker Arms - SB Chevy V8 265-400 - 7/16" Stud - 1.6 Ratio - (Set of 8) 1805-8 at low everyday prices. Be sure to check out all of our products from Comp Cams including Comp Cams Steel Roller Rocker Arms - Small Block Chevy.