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Upgrade your engine's performance with the HASTINGS Evolution Big Twin Piston Rings, designed specifically for 3.498-inch bore applications. This comprehensive set includes top compression rings, second compression rings, and oil control rings, providing a complete solution for piston sealing and efficiency. The top compression rings feature a barrel face with a cast coating, which enhances heat transfer between the piston and cylinder wall, helping to maintain optimal operating temperatures and prevent overheating. These rings effectively seal the combustion chamber gases, allowing the piston to transfer the energy generated during combustion efficiently to the crankshaft, improving power output and engine responsiveness. The second compression rings are reverse torsional taper face rings that promote side sealing, preventing oil from being forced under or behind the ring during operation. This design results in better oil economy and reduces oil consumption. The reverse twist combined with the taper-machined ring face mimics the scraping edge of a positive twist torsional ring, providing effective debris clearance and maintaining optimal piston ring seal. The oil control rings are a three-piece flex vent design, which allows the rails to have a small cross-sectional area for better conformability within the bore. This design ensures uniform pressure distribution through four steel rails and two expanders, delivering reliable oil control and reducing oil consumption. Made in the USA, these rings are engineered for durability and consistent performance. The set includes enough rings for two pistons, with two rings per groove, except for the rails which are two rail rings per one expander ring. Whether you're rebuilding or upgrading, the HASTINGS Piston Rings offer trusted quality and precise fitment for your Big Twin engine, ensuring optimal sealing, improved efficiency, and extended engine life.
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