Crane Cams Nitro-Carb rockers offer 3 to 5 times greater resistance to wear, fatigue and fracture in high-stress areas. Available exclusively from Crane Cams, Nitro-Carb rockers eliminate pushrod cup and fulcrum failures with wear resistance and surface hardness properties that are similar to ceramics. 3 To 5 Times Stronger Than Stock-Type Steel Rockers Precision Die-Formed Steel Most Ratio-Accurate Available Small & Big-Block Chevy Applications Nitro-Carb rockers deliver the most accurate ratios of any similar steel rockers. Nitro-Carb rockers are precision die-formed from heat treated steel. Most feature a long-slot design, and come complete with oil-groove pivot balls and adjusting nuts at no extra charge. Crane Cams Nitro-Carb rockers are perfect for high valve spring pressure. Testing in-lab and on-track, (using Crane 99846-16, H-11 Tool Steel, stock diameter, 1. 255" o. d. valve springs, 115 lb. seat, 350 lbs. open pressure!) showed Crane Nitro-Carb rockers to be failure-free after enduring millions of running cycles. Nitro-Carb rockers should be used anywhere rules require "stock type steel rockers". This includes NHRA and IHRA Stock Class drag racing applications plus oval track categories where stock-type rockers are required.Pit Stop USA offers Crane Cams Nitro Carb Stamped Steel Rocker Arm Set - SB Chevy - 1.5 Ratio, 3/8" Rocker Arm Stud w/ Extra Long Slot - (Non-Self Aligning) 11801C-16 at low everyday prices. Be sure to check out all of our products from Crane Cams including Crane Cams Stamped Steel Rocker Arms - Small Block Chevy.