ARP 900-0550 4.005 Bore Ring Compressor | 01-16 GM 6.6L Duramax

ARP Ring Compressors are CNC-machined from 6061-T6 billet tube material with a true radius for every bore diameter. The true radius design is far superior to conventional "tapered" devices and widely used by professional engine builders. Compressors are relieved on the bottom for wire O-rings and Type 3 anodized for long life. Bore sizes are prominently engraved in 3/4" numbers for easy identification. Standard stocking sizes range from 3.552" to 4.750" and 75mm to 95.5mm.

*ARP products are NOT RETURNABLE if factory packaging is broken.