Speedmaster Rocker Arm Kit 1-261-021;

Speedmaster DNA_ roller rockers are the toughest and most innovative rockers we've ever made. Crafted from certified aircraft-quality heat-treated aluminum they're matched to massive precision-ground trunnions for superior durability and optimized rocker arm geometry evenly distributes the load for maximum strength. DNA_ rocker arms also utilize oversized needle roller bearings for better load distribution and longer service life. Finally they're black anodized; you'll want to leave your valve covers off! Speedmaster Aluminum Shaft-Mount Rockers can withstand valve spring loads up to 700Ibs the extruded body has a tensile strength of over 60 000 PSI.