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Upgrade your Big Twin engine with the HASTINGS piston ring set designed for 3.437-inch bore and .070-inch ring gap. This comprehensive set includes top compression rings, second compression rings, and oil control rings, providing all essential components for optimal engine performance. The top compression rings feature a barrel face design that enhances heat transfer between the piston and cylinder wall, helping to maintain proper operating temperatures and improve engine efficiency. They also control combustion gases, ensuring maximum energy transfer from expanding gases to the crankshaft for smooth power delivery. The second compression rings are reverse torsional taper face rings that promote side sealing, preventing oil from leaking under and behind the rings, which results in better oil economy and cleaner combustion. Their taper-machined face and reverse twist design mimic the scraping edge of positive twist torsional rings, providing reliable sealing and wear resistance. The oil control rings are a three-piece flex vent design, allowing for better conformability to the bore and ensuring consistent oil regulation. Their small cross-sectional rails are manufactured for optimal contact, while four steel rails with two expanders distribute pressure evenly to prevent oil consumption and sludge buildup. Made in the USA, these rings are engineered to fit perfectly with KB pistons, but special attention should be given to the top ring end gap during installation, as specified in your piston’s instructions. This set includes enough rings for two pistons, with two rings per groove—except for the rails, which are paired with two rail rings per expander. Proper installation ensures maximum longevity and performance, making this piston ring set ideal for rebuilding or maintaining your Big Twin engine with precision and reliability.
Features:
US Dollars
