NEW PROCOMP/HEADER 1.7 X 7/16 BB CHEVY STAINLESS ROLLER ROCKER ARMSCALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. PC2330 PCE261. 1140 PM005 351717076801 New Super Duty Series Stainless rocker arms for your Big block Chevy They are 1. 7 ratio and for standard 7 16 rocker studs. Extra large trunnions with more sleeve bearings to reduce wear are standard in the SD series, along with a Jumbo roller pin for up to 600lbs. of open pressure. There is only one rocker arm pictured, but you will get the Complete Set of 16