S&S Cycle Stock Bore Cylinder and Stroker Piston Kit for 1966-1984 Harley-Davidson Shovelhead

S&S Cycle Stock Bore Cylinder and Stroker Piston Kit for 1966-1984 Harley-Davidson Shovelhead

The stroker piston approach gets more displacement from a Shovelhead without the bore cost or case modification of a big bore kit. These S&S 3.4375 inch cylinders with high-compression forged stroker pistons can build 84, 86, or 88 cubic inch engines depending on the flywheel stroke used – making this one of the most versatile Shovelhead displacement solutions available.

Key Features

• 3.4375 inch bore high tensile cast iron cylinders for 84, 86, or 88 cubic inch stroker engine builds
• Forged pistons with rings and wristpins – 8.4:1 compression with 4.5 inch stroke
• Compression varies by stroke: 8.4:1 at 4.5″, 9.4:1 at 4.625″, 10.8:1 at 4.75″
• Compatible with 4.5 inch or 4.75 inch flywheel assemblies
• Includes stainless steel head bolts with washers, base nuts, head gaskets, and base gaskets
• Made in the USA by S&S Cycle

Technical Specifications

• Bore: 3.4375 inches (3-7/16″)
• Stroke Options: 4.5″, 4.625″, or 4.75″ depending on flywheel used
• Displacement: 84, 86, or 88 cubic inches depending on stroke
• Compression Ratio: 8.4:1 at 4.5″ stroke / 9.4:1 at 4.625″ / 10.8:1 at 4.75″
• Piston Type: Forged with rings and wristpins
• Flywheel Compatibility: 4.5 inch or 4.75 inch
• Included: Cylinders, pistons with rings and wristpins, head gaskets, stainless steel head bolts with washers, base nuts, base gaskets
• Fitment: 1966-1984 Harley-Davidson Shovelhead engines
• Origin: Made in USA

Fitment Notes

• Fits 1966-1984 Harley-Davidson models with Shovelhead engines
• Displacement and compression ratio depend on the flywheel stroke used – verify flywheel specification before ordering
• Can replace cylinders and pistons in an existing S&S stock bore stroker kit
• Review the Fitment tab for the complete year and model breakdown