HASTINGS Replacement Piston Rings — Bore 3.437 in, Oversize +0.030 in – 41-47, 49-64, 70-80 Big Twin, 80 Touring

Replacement piston ring set designed for reliable sealing, heat transfer, and oil control. 🔧

• Includes top compression rings, second compression rings, and oil control rings.
• Top compression rings are barrel face to aid heat transfer and sealing.
• Second compression rings are reverse torsional taper face for improved side sealing and oil economy.
• Oil control rings are three-piece flex vent with two expanders and four steel rails for positive oil control.
• Made in the USA 🇺🇸.

Reverse twist ring and taper-machined ring face duplicate the scraping edge of a positive twist torsional ring, promoting consistent performance.

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

Kit includes:

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