S&S CYCLE 136" Big Bore Kit — 4.320", 4.625" Stroke, 136" – 18-23 Softail, 21, 23 Touring, 17-23 Trike, 20-22 CVO

Built around 4.320" big bore cylinders and an S&S 4-5/8" (4.625") stroker flywheel, this kit is designed to deliver 136" displacement when used with the required components.

It maintains original factory engine height to help preserve stock frame and exhaust clearance, and it retains the original engine serial numbers.

Fitment notes:

• Direct bolt-on for 114" and 117" with stock flywheel to make 132" high-compression displacement
• To reach 136", an upgrade to the S&S 4.625" stroker flywheel is required
• 107" engines require the S&S 4.625" stroker flywheel assembly to achieve 136"
• Does not fit models equipped with Variable Valve Timing (VVT)
• Not compatible with H-D 4-5/8" stroke flywheel

Includes cylinders with ductile iron liners, forged piston kits, MLS head gaskets, base gaskets, cylinder O-rings, and an S&S Cycle 136" cam cover badge.