How to install pistons into the cylinder. Jay uses the ARP ring compressor tool. This ring compressor has a tapered inner surface that helps you slide the piston into the block with the rings installed. As the piston slides down the cylinder, the rings push into the ring-lands allowing the piston to slide into the bore. Its a must-have for assembling your engine. Contact us if you need one 👍 #Realstreetperformance #realst #realstreet #realstreetpowersports #enginebuild #ringcompressor #arp #arp