S&S Cycle 91-7210 Stock Bore Cylinder Set for Harley Evolution

The S&S Cycle 91-7210 cylinder set offers a premium replacement option for Harley-Davidson Evolution engines. Engineered by S&S Cycle, a trusted name in V-twin performance, these cylinders deliver significant improvements over factory components.

Key Features:

• 3-1/2 inch stock bore diameter for direct Evolution engine replacement
• Cast iron cylinder liners for superior durability and heat dissipation
• Reinforced cylinder walls with improved rigidity to resist warpage
• Enhanced machining process ensures straighter walls for better piston seal
• Precision-machined mating surfaces for optimal head and base gasket sealing
• Natural finish aluminum construction
• Sold as a pair (cylinders only, pistons and gaskets sold separately)

The improved wall structure and precision machining create a more stable platform for piston rings, resulting in better compression, reduced oil consumption, and improved engine longevity. These cylinders are ideal for engine rebuilds where OEM-equivalent bore dimensions are required with performance-grade quality.