HASTINGS Replacement Piston Rings — Bore 3.437", Oversize +0.060" – 41-47, 49-64, 70-80 Big Twin, 80 Touring

Includes top compression rings, second compression rings, and three-piece oil control rings for positive oil control. 🔧

Top compression rings are barrel face, and second compression rings feature a reverse torsional taper face to promote side sealing and improved oil economy.

The three-piece flex vent oil control rings use four steel rails and two expanders to provide uniform pressure and excellent conformability to the bore.

These rings aid heat transfer between the piston and cylinder wall and control combustion gases so the piston can transfer energy to the crankshaft.

Made in the USA. Due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap; please read the instructions furnished with the piston for correct ring installation. Includes enough rings for two pistons; two rings per groove except for the rails, which have two rails per one expander.