This Aluminum Roller Rocker Arm from COMP Cams® is designed for Chevy V8 265-400 and V6 200-262 applications. Engineered with a 7/16" stud diameter and 1.65 ratio, it is made from a high quality aluminum alloy with a tensile strength of 80,000 psi. Needle bearing trunions allow valve spring pressures of up to 350 lbs. open pressure, making Aluminum Roller Rocker Arms a good choice for many street applications.