Powerhouse Tapered Piston Ring Compressors. Install pistons into the cylinder bore with one of our tapered Ring Compressors. These tools gently squeeze the piston rings and funnel the piston into the bore without piston ring damage or piston ring breakage. Available in all popular sizes, these extra tall aluminum ring compressors are hard anodized for long life. Designed to work on blocks with studs, they also feature a handy finger registration groove.
4.670" to 4.830"