ARP (900-0900) GM/Chevy 4.0900˝ Ring Compressor Specialty Kit
ARP Chevy/GM 4.0900'' Ring Compressors 900-0900
ARP's ring compressors are CNC machines from 6061-T6 billet tube material and feature a true radius for each different bore diameter. They are relived for wire O-rings on bottom. Type 3 anodizing is used for long life, and the bore size is prominently engraved in 3/4" high numbers for easy identification. Standard stocking sizes from 3.552" to 4.750" (SAE) and 75mm to 100mm (metric). The true radius design is far superior to conventional "tapered" devices, and widely acclaimed by professional engine builders!