HASTINGS Replacement Piston Rings — Bore 3.437", Oversize +0.040" – 41-47, 49-80 Big Twin, 80 Touring

🔧 Replacement piston ring kit engineered for reliable sealing and oil control throughout the combustion cycle.

The kit includes top compression rings with a barrel face and second compression rings with a reverse torsional taper face, promoting side sealing to prevent oil from being forced under and behind the ring for better oil economy.

Reverse twist rings combined with a taper-machined ring face duplicate the OD bottom-side scraping edge of a positive twist torsional ring and assist heat transfer between the piston and cylinder wall.

Oil control rings are a three-piece flex vent design; the three-piece rails provide a small cross-sectional area for better conformability to the bore and deliver uniform pressure via four steel rails and two expanders for positive oil control.

Includes enough rings for two pistons. Two rings per groove, except for the rails where two rail rings sit per one expander.

Please read the instructions furnished with the piston: due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap for correct installation.

• 2× Top Compression Rings 0.0625"
• 2× Second Compression Rings 0.0625"
• 2× Expander Rings
• 4× Steel Rails

Made in the USA 🇺🇸