ARP 899-8900 Tapered Ring Compressor 3.890

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This ARP 899-8900 Tapered Ring Compressor is for a 3.890" bore and CNC-machined from 6061-T6 billet aluminum tube material. Featuring a true radius for each individual bore diamete r, they're also relieved to accommodate wire O-rings on the bottom. ARP uses Type 3 anodizing for long life, with the bore size prominently engraved in 3/4 in. high numbers for easy identification. ARP 899-8900 Tapered Ring Compressor Fits: 3.890" Bore ARP's true-radius design tapered ring compressors are far superior to conventional "tapered" devices, and widely acclaimed by professional engine builders! Dozens of sizes are available for both standard and metric applications. This is truly the very best piston ring compressor on the market today! Show more