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Upgrade your engine's performance with the HASTINGS piston rings designed specifically for 74-inch Big Twins. These precision-engineered rings include top compression rings, second compression rings, and oil control rings, ensuring optimal sealing and efficient combustion. The top compression rings feature a barrel face that facilitates heat transfer between the piston and cylinder wall, helping to maintain proper operating temperatures and prevent overheating. They also effectively control combustion chamber gases, transferring the energy of expanding gases to the crankshaft for smooth power delivery. The second compression rings are designed with a reverse torsional taper face, promoting side sealing that prevents oil from leaking under and behind the ring, which enhances oil economy and engine longevity. Along with a taper-machined face and reverse twist, these rings replicate the scraping edge of a positive twist torsional ring, providing durability and reliable sealing. The oil control rings are three-piece flex vent designs that offer excellent conformability to the bore with a small cross-sectional profile. This design ensures uniform pressure through four steel rails and two expanders, delivering consistent and effective oil control. Made in the USA, these rings are compatible with pistons that require special attention to the top ring end gap due to the thermal properties of KB pistons. Proper installation is essential for optimal performance, and detailed instructions are included to guide the process. Each set includes enough rings for two pistons, with two rings per groove—except for the rails, which are paired with two rail rings per one expander ring, ensuring comprehensive coverage and sealing efficiency. Whether you're rebuilding or enhancing your engine, these Hastings piston rings provide reliable performance, durability, and efficient oil consumption, making them an excellent choice for Big Twin motorcycle engines.
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