Manufactured to exacting quality, these 5/16" rods boast meticulously formed ends with exact radii, outstanding concentricity, closely controlled length and painstaking heat treatment for guide plate compatibility. These pushrods are designed for applications not to exceed 400 lbs. open spring pressure and/or 7500 rpm. Great for hydraulic or solid lifter cams. These pushrods are an excellent choice for all racers interested in durability without busting their budget.