S&S CYCLE 91-7210 3.500-inch Bore Cylinder for Evolution Big Twin Engines

Enhance your Harley-Davidson Evolution Big Twin with the S&S CYCLE 91-7210 3.500-inch bore cylinder, designed for 80-inch or 89-inch engines equipped with stock, S&S® Performance, or Super Stock® heads. These cylinders feature thicker castings and larger cooling fins, providing superior heat dissipation and durability compared to original stock components. Crafted with a cast iron liner, they ensure long-lasting wear resistance and reliable performance for demanding riding conditions. The cylinders are bored slightly under the standard size and are not honed, allowing for precise fitment during installation. This makes them an ideal stock replacement part that maintains compatibility with your existing engine setup. Each cylinder includes dowel pins for secure mounting and alignment, simplifying installation and ensuring proper engine assembly. Made in the USA, these cylinders meet high manufacturing standards, offering quality assurance and excellent craftsmanship. Super Stock® pistons designed for 80-inch engines can be used with stock 80-inch flywheels without requiring rebalancing, preserving engine balance and smooth operation. Whether rebuilding or upgrading, these cylinders provide the performance, durability, and fitment you need for a reliable and powerful ride.

Features:

• Bore size: 3.500 inches, suitable for 80-inch or 89-inch Big Twin engines

• Constructed with thicker castings and larger cooling fins for improved heat dissipation

• Stock replacement with cast iron liner for enhanced wear resistance

• Bored slightly under standard size; not honed for precise fitting during installation

• Includes dowel pins for secure mounting and precise alignment

• Compatible with Super Stock® pistons for 80-inch engines without rebalancing

• Made in the USA with high-quality manufacturing standards