BZ Series Pushrods
BZ Series (Bronze Insert) pushrods are designed for extremely high-horsepower engines, such as Pro Mods, Top Sportsman teams, and large-displacement nitrous engines. Constructed from 4130 chromoly thick-wall tubes, preformed and centerless-ground with a high-load bearing bronze insert, these shelf-stock items are ready for demanding applications with high valve spring pressures, huge-lift cams, and high rpm.
All BZ series pushrods are case hardened to Rockwell Rc60 for extra strength and rigidity and made available in straight form, single taper, or double taper (tapered from the center to each end). To lubricate the upper cup and rocker ball, a thin oil passageway runs through the center of the pushrod allowing pressurized oil to travel from the lifter bore to the rocker. They are available with diameters of 7/16" x .165" walls, 1/2" x .200" walls, or 9/16" x .187" walls. On the lifter end they are manufactured with conventional ball-end diameters of 5/16 or 3/8 inch. On the rocker end, the bronze insert is press-fitted and machined with a 0.140-inch radius cup, designed to accept popular 9/32" rocker adjuster ball. In addition, BZ pushrods are now available on Trend’s 24-hour Quick Ship Program.