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The Hastings 2M4941 piston ring set is designed for 3.875-inch standard bore engines, suitable for 95 and 103 cubic inch big bore applications in Twin Cam motors. This comprehensive set includes top compression rings, second compression rings, and oil control rings, providing the 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, improving thermal efficiency and preventing overheating during operation. These rings also effectively control combustion gases, allowing the piston to transfer energy efficiently to the crankshaft, which results in smoother power delivery and improved engine responsiveness. The second compression rings utilize a Napier, reverse twist design with a taper-machined ring face that mimics the bottom side scraping edge of positive twist torsional rings. This configuration promotes side sealing, preventing oil from being forced under or behind the ring, which enhances oil economy and reduces oil consumption over time. The oil control rings are three-piece Flex Vent designs, allowing the rails to be manufactured with a smaller cross-sectional area for better conformity to the bore. This design provides uniform pressure through four steel rails and two expanders, ensuring superior oil control and minimizing oil blow-by. Crafted in the USA, this set includes enough rings for two pistons, with two rings per groove, except for the rails, which include two rail rings per one expander ring. Whether rebuilding or upgrading your engine, the Hastings piston ring set offers reliable performance and durability, making it an excellent choice for Twin Cam engines requiring high-quality sealing and heat transfer features.
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