ARC Racing 6053 Billet Duplex Crankcase Cover - Briggs OHV Stroker - Modified ClassWhen pushing Briggs OHV stroker engines past 10,000 RPM, standard racing go kart parts simply cannot survive the immense internal pressures and parasitic drag. The ARC Racing 6053 Billet Duplex Crankcase Cover is engineered specifically for the 555705 block, delivering the ultimate bottom end fortification for extreme modified builds. Machined from solid aerospace grade aluminum, this cover houses duplex timing gears with zero tolerance precision,