ARP 901-7800 Billet Aluminum Piston Ring Compressor Tool

The ARP 901-7800 is a professional-grade piston ring compressor designed for precision engine assembly. CNC-machined from 6061-T6 billet aluminum tube stock, this tool features a true radius bore that matches the cylinder diameter exactly, ensuring smooth piston installation without risk of ring damage.

Key Features:

• True radius design eliminates the taper found in conventional compressors for superior ring alignment
• CNC-machined from 6061-T6 billet aluminum for durability and dimensional accuracy
• Type III 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
• Trusted by professional engine builders for precision piston installation

The true radius design of ARP ring compressors provides uniform compression around the entire ring pack, preventing ring breakage and ensuring proper seating. The relieved bottom edge allows the tool to clear wire-type O-rings commonly used on block decks. Available in both SAE sizes (3.552 to 4.750 inches) and metric sizes (75mm to 95.5mm) to cover a wide range of engine applications.