HASTINGS Replacement Piston Rings — Bore 3.437", Oversize +0.010" – 41-47, 49-64, 70-80 Big Twin, 80 Touring

🔧 Replacement piston rings include top compression rings, second compression rings, and oil control rings to restore sealing and oil control.

Top compression rings feature a barrel face to aid heat transfer between the piston and cylinder wall and to control combustion gases so energy is transferred to the crankshaft.

Second compression rings are reverse torsional taper face to promote side sealing and prevent oil from being forced under and behind the ring, improving oil economy.

Reverse twist design combined with a taper-machined ring face duplicates the OD bottom-side scraping edge of a positive twist torsional ring.

Oil control rings use a three-piece flex vent design; two rails and an expander provide uniform pressure and positive oil control while conforming to the bore.

Includes enough rings for two pistons; two rings per groove except for the rails, which are two rail rings per one expander ring.

Please read the instructions furnished with the piston for correct top ring end gap due to thermal conductivity and piston design.

Made in the USA.