Hastings Piston Rings - Big Bore - Big Twin 2M5721

Features

• Includes top compression rings, second compression rings, and oil control rings
• Helps in the the heat transfer process between the piston and cylinder wall
• Controls combustion chamber gases allowing the piston to transfer the energy of the expanding combustion gases, to the crankshaft
• Promotes side sealing that prevents oil from being forced under and behind the ring resulting in better oil economy
• Reverse twist ring along with a taper-machined ring face duplicates the OD bottom side scraping edge of a positive twist torsional ring
• Three-piece design allows rails to be manufactured with a small cross sectional area for better conformability to bore
• Provides uniform pressure through four steel rails and two expanders assuring positive oil control
• Made in the USA