4.155 Tapered Ring Compressor

The ARP 4.155 Tapered Ring Compressor (Part No. 900-1550) is a precision engine assembly tool specifically designed for piston ring installation in 4.155-inch bore engines. This tapered aluminum compressor aids in managing piston rings during block preparation and engine rebuilds, helping to minimize the risk of ring damage during installation.

Constructed from lightweight aluminum, the compressor features a black anodized finish that protects against corrosion, making it suitable for both machine shop and garage environments. Its tapered design is intended to assist in compressing ring sets effectively, which is crucial for proper piston seating and ring seal integrity in various engine applications.

Engine builders, machine shops, and automotive enthusiasts performing top-end rebuilds will find this tool essential for ensuring clean installations. The 4.155-inch bore size is compatible with numerous small-block and mid-displacement engines commonly used in street performance and racing builds, helping to prevent costly mistakes during assembly.