HASTINGS Replacement Piston Rings — Bore 3.437" , Oversize +0.040" – 41-47, 49-64, 70-80 Big Twin, 80 Touring

Replacement piston rings engineered for reliable sealing and oil control. 🔧

• Includes top compression rings, second compression rings, and oil control rings.
• Top compression rings are barrel face to aid heat transfer between the piston and cylinder wall.
• Second compression rings are reverse torsional taper face to promote side sealing that prevents oil from being forced under and behind the ring, improving oil economy.
• Reverse twist ring with a taper‑machined ring face duplicates the OD bottom‑side scraping edge of a positive twist torsional ring.
• Oil control rings are a three‑piece flex vent design with two expanders and four steel rails for uniform pressure and positive oil control.
• Made in the USA and includes enough rings for two pistons unless noted.
• Please read the piston installation instructions for the correct top ring end gap.