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.
ARP Ring Compressor 89-07 Dodge 5.9L
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