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Your cart is empty.ARP's new ring compressors are CNC machined from 6061-T6 billet tube material and feature a true radius for each different bore diameter. What's more, they are relieved 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 95.5mm (metric). The true radius design is far superior to conventional tapered devices, and widely acclaimed by professional engine builders This is truly the very best piston ring compressor on the market today. Ring Compressor Size 4.020in
john cuddy
Reviewed in the United States on February 9, 2023
Worked great on 5.9 Cummins
Norm
Reviewed in the United States on August 27, 2022
Worked flawlessly without damaging and rings
Mike B
Reviewed in the United States on March 18, 2022
Dislike. Maybe the price a little. What did liked Is that it worked as it should. I was able to push the piston into the cylinder bore with my fingertips. ARP make quality tools and parts
James
Reviewed in the United States on April 22, 2021
Worked out great, pistons were sliding in bore smoothly with no problem. Would definitely recommend!
Darron Preston
Reviewed in the United States on June 29, 2020
The Tapered Ring Compressor works great. Needed this for my 5.9 Cummins Diesel. Great pricing and delivery was great. I recommend and would buy again.
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