Probe is excited to release the new Shaft System for Big Block Chevy engines. They feature light weight but strong 2024 T-3511 extruded alloy rocker bodies with dual, fully caged Torrington needle roller bearings. Also featured are tool steel nose rollers and axels for smooth long lasting performance. The steel stands are CNC machined and feature locating dowels for precise roller over valve alignment. They are available in 1.7 and 1.8 ratios and fit all stock and aftermarket cylinder heads with stock rocker boss to valve relationship.