The ARP 901-8150 Tapered Piston Ring Compressor is a precision engine building tool designed to streamline piston installation while protecting rings from damage. Unlike generic adjustable compressors, this fixed-diameter tool features a true radius taper that gradually and evenly compresses the rings as the piston moves into the bore.Each compressor is CNC-machined from high-strength 7075-T6 aluminum and finished with a Type III hard-anodized coating. This combination ensures long-term durability and a low-friction surface that prevents rings from catching or breaking during the assembly process. It is an essential tool for technicians and engine builders who require exact tolerances and repeatable results. Bore Diameter: 81.5mm Material: 7075-T6 Aluminum Finish: Black Hard-Anodized Design: CNC-Machined Tapered Bore Manufacturer Part Number: 901-8150
