ARP Ring Compressor (901-7850)

The ARP Ring Compressor (901-7850) is a specialized kit designed to facilitate the installation of piston rings in high-performance engine builds. Crafted from CNC-machined 6061-T6 billet aluminum, these ring compressors feature a true radius for each bore diameter, ensuring precise and uniform compression. The relieved design accommodates wire O-rings on the bottom, enhancing compatibility with various piston configurations. Type 3 anodizing provides increased durability and corrosion resistance, while prominently engraved bore sizes in high-visibility numbers allow for quick identification during assembly. The true-radius design surpasses conventional tapered compressors by offering superior fitment and reduced risk of piston damage, making it an essential tool for professional engine builders and enthusiasts seeking reliable, long-lasting performance.

This ring compressor kit is suitable for use with engines requiring bore sizes around 78.5 mm, commonly found in performance and racing applications. It is compatible with a range of piston and ring configurations, particularly where precise bore sizing and O-ring accommodation are critical. Designed for professional and serious DIY engine assembly, the compressor provides a secure, easy-to-use solution for installing piston rings without damaging delicate components. The kit includes the necessary tapered ring compressors, each engraved with the bore size for easy selection. Ideal for engine rebuilds, performance upgrades, and race engines, this tool ensures accurate, efficient installation for optimal engine performance and longevity.