4.350 Tapered Ring Compressor

The 4.350 Tapered Ring Compressor from ARP is an essential tool for any serious engine builder or mechanic performing piston and ring installation on large-displacement or high-performance engines. This precision instrument compresses piston rings into a controlled, tapered profile, allowing safe insertion of pistons into cylinder bores without damaging the delicate rings or cylinder walls.

Whether you're rebuilding a stroker motor, installing forged pistons, or performing top-end work on a modified engine, this ring compressor delivers the reliability and precision that professional technicians demand. ARP's tapered design provides a smooth, progressive compression that holds rings securely without binding or causing micro-fractures in the ring material—a critical consideration when working with premium cast-iron or coated rings.

The 4.350-inch bore diameter accommodates larger-displacement engines commonly found in muscle cars, trucks, and high-output performance builds. The compact 5.75 x 2.2 x 9.65-inch footprint makes it easy to maneuver in tight engine compartments during installation, making it ideal for builders working with big-block Chevrolet, Ford, Mopar, and other large-bore platforms.