4.135 Ring Compressor

The ARP 4.135 Ring Compressor is a precision engine building tool designed for mechanics and engine builders who need reliable piston ring control during engine assembly. This tapered ring compressor fits 4.135-inch bore applications and is engineered to compress piston rings safely and consistently, preventing ring damage during the critical piston-to-cylinder insertion phase. Whether you're rebuilding a high-performance stroker engine or servicing OEM powerplants, this tool eliminates the risk of broken rings and scored cylinder walls.

Constructed from aluminum and finished in black anodize, the ARP 4.135 Ring Compressor features a tapered design that applies even, progressive pressure to compress rings without binding or sudden release. The tapered geometry allows smooth entry and controlled compression, reducing the chance of ring breakage that occurs with inferior designs. Black anodized aluminum provides corrosion resistance and durability in both shop and field environments, while the lightweight construction (0.45 lbs) makes it easy to handle during extended engine work without user fatigue.

Professional engine builders, dealership technicians, and serious enthusiasts rebuilding engines with 4.135-inch bore diameters will find the ARP model essential for consistent, damage-free assembly. Installation is straightforward: slide the compressor over the piston and rings, tighten gradually to compress the ring set, then guide the piston into the cylinder bore. This tool is invaluable for small-block applications and similar displacement engines where ring failure during installation can compromise engine reliability and increase rebuild costs significantly.