Tapered Ring Compressor Fits 4.280 Bore

The PROFORM tapered ring compressor fits 4.280 bore is an essential engine assembly tool for any serious engine builder or mechanic tackling piston installation on big-block or late-model stroker builds. This tool is designed to temporarily squeeze piston rings into the grooves, allowing the piston to slide cleanly into the bore without damaging the rings or cylinder walls.

Constructed from aluminum, this ring compressor offers both durability and lightweight handling during long assembly sessions. The tapered design accommodates the 4.280-inch bore specification common in performance applications, ensuring even, consistent compression around the entire piston circumference, which reduces the risk of ring stacking or uneven seating.

This tool is indispensable for engine builders, machine shops, and enthusiasts rebuilding big-block Chevys, Fords, and Mopars in the 4.280-bore range. Whether you're performing routine maintenance or a full rebuild, this tapered ring compressor is a reliable choice for achieving a clean, first-time-right installation.