ARP 4.055 in. Ring Compressor

This ARP ring compressor is a precision assembly tool designed to compress piston rings for easy installation into cylinders, sized specifically for 4.055 in. bores. Built for engine builders and machine shops, the 4.055in ring compressor from ARP streamlines piston fitment and helps maintain ring orientation during insertion for reliable, repeatable engine assembly.

Features:

• 4.055 in. diameter ring compressor
• ARP branded assembly tool