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Upgrade your engine's performance with the HASTINGS 2M4985 piston ring set designed for 3.875-inch bore Twin Cam applications. This comprehensive set includes top compression rings, second compression rings, and oil control rings, providing all the essential components for optimal piston sealing and combustion efficiency. 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 longevity. These rings also effectively control combustion gases, allowing the piston to transfer energy efficiently to the crankshaft. The second compression rings are designed with a reverse torsional taper face, promoting side sealing that prevents oil from passing under and behind the ring, which results in better oil economy and cleaner combustion. This reverse twist ring, combined with a taper-machined ring face, mimics the scraping edge of a positive twist torsional ring to ensure effective debris removal and sealing. The oil control rings are a three-piece flex vent design, allowing the rails to be manufactured with a small cross-sectional area for better conformability within the bore. This design ensures uniform pressure through four steel rails and two expanders, providing consistent oil control across the piston’s lifespan. Made in the USA, these rings are engineered for durability and precision fit, with specific attention to the top ring end gap due to the thermal conductivity of KB pistons. Proper installation following the instructions provided is crucial for optimal performance. The set includes enough rings for two pistons, with two rings per groove and two rail rings per expander ring, making it an ideal choice for rebuilding or enhancing your engine's efficiency and reliability.
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