ARP 901-8600 Billet Aluminum Piston Ring Compressor

The ARP 901-8600 is a precision-engineered piston ring compressor designed for professional engine builders and serious enthusiasts. Unlike conventional tapered designs, this compressor features a true radius bore that perfectly matches the cylinder diameter, ensuring smooth, damage-free piston installation every time.

Premium Construction:

• CNC-machined from 6061-T6 billet aluminum tube for exceptional strength and dimensional accuracy
• Type 3 hard anodized finish for superior wear resistance and long service life
• True radius bore design eliminates the risk of ring damage during installation
• Relieved bottom edge accommodates wire O-rings without interference
• Bore size prominently engraved in 3/4-inch high numbers for quick identification

Professional Performance:

• True radius design provides uniform compression around the entire piston ring pack
• Prevents ring breakage and ensures proper ring seating
• Reduces installation time compared to adjustable or tapered compressors
• Widely preferred by professional engine builders for critical builds

ARP offers these precision ring compressors in standard SAE sizes from 3.552 to 4.750 inches and metric sizes from 75mm to 95.5mm. Each compressor is bore-specific to ensure perfect fit and optimal performance. This is the professional-grade solution for anyone serious about engine assembly quality.