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Upgrade your Harley Davidson Big Twin engine with the HASTINGS Evolution piston rings set, part number 6164010. This comprehensive kit includes top compression rings, second compression rings, and oil control rings, all designed to optimize engine performance and longevity. The top compression rings feature a barrel face with cast coating, which enhances heat transfer between the piston and cylinder wall, promoting efficient combustion and reducing thermal stress. These rings help control combustion gases, transferring energy from the expanding gases to the crankshaft for smooth power delivery. The second compression rings have a reverse torsional taper face, enabling superior side sealing that minimizes oil consumption by preventing oil from passing under or behind the rings. This design, combined with a reverse twist and taper-machined ring face, effectively duplicates the scraping edge of positive twist torsional rings, ensuring optimal sealing and durability. The oil control rings are three-piece flex vent types, engineered with small cross-sectional rails for better conformability to bore surfaces. Their design ensures uniform pressure through four steel rails and two expanders, providing excellent oil control and reducing oil consumption. Crafted in the USA, these rings are suitable for pistons with a 3.498-inch diameter and a +0.010-inch oversize bore, making them an ideal choice for rebuilding or enhancing your Harley Davidson Big Twin engine. Each set includes enough rings for two pistons, with two rings per groove—except for the rails, which are configured with two rail rings per one expander ring—ensuring comprehensive coverage for your engine rebuild or upgrade. Whether you're restoring or optimizing performance, these Hastings piston rings deliver quality, precision, and reliable performance for demanding motorcycle applications.
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