78-E83 80" B/T STD CAST RINGS (PR)

Includes enough rings for two pistons (unless noted). Made in the USA Two rings per groove, except for the rails that will be two rail rings per one expander ring. Provides uniform pressure through four steel rails and two expanders assuring positive oil control Three-piece design allows rails to be manufactured with a small cross sectional area for better conformability to bore Oil Control Rings are Three Piece Flex Vent Reverse twist ring along with a taper-machined ring face duplicates the OD bottom side scraping edge of a positive twist torsional ring Promotes side sealing that prevents oil from being forced under and behind the ring resulting in better oil economy Second Compression Ring are Reverse Torsional Taper Face Controls combustion chamber gases allowing the piston to transfer the energy of the expanding combustion gases, to the crankshaft Helps in the the heat transfer process between the piston and cylinder wall Cast coated Top Compression Rings are Barrel Face Includes top compression rings, second compression rings, and oil control rings