ARP 901-9400 Billet Aluminum Piston Ring Compressor Tool

The ARP 901-9400 piston ring compressor is a professional-grade engine assembly tool designed for precision piston installation. CNC machined from 6061-T6 billet aluminum tube material, this ring compressor features a true radius design that ensures even compression around the entire circumference of the piston rings, eliminating the risk of ring breakage during installation.

Key Features:

• CNC machined from 6061-T6 billet aluminum for superior strength and durability
• True radius bore design provides uniform compression, far superior to conventional tapered compressors
• Type 3 hard anodized finish for long-lasting wear resistance
• Relieved bottom edge accommodates wire O-rings without interference
• Bore size prominently engraved in 3/4-inch high numbers for quick identification
• Precision tolerances ensure proper fit and reliable operation

Widely acclaimed by professional engine builders, ARP ring compressors deliver consistent results and eliminate the guesswork and frustration associated with tapered-style compressors. The true radius design allows rings to seat evenly as the piston enters the cylinder bore, preventing ring damage and ensuring proper installation every time. An essential tool for any serious engine builder or machinist.