The unique design of the Pro Magnum Rocker enables us to use a larger trunion with more needle bearings. This spreads the load more evenly and the rocker will last longer. Other features include an integral pushrod seat that ensures accuracy and saves weight, and a unique rocker design also provides plenty of clearance for most high performance valve springs. Ideally suited for performance street, bracket racing, super classes, and circle track racing. You won't find a better roller rocker for the price.