S&S CYCLE 84" Stock Bore Stroker Kit — 4-1/2" stroke – 70-84 Big Twin, 79-83 Touring, 82-84 FXR, 84 Police

The 84" Stock Bore Stroker Kit brings increased displacement and a thicker midrange to compatible Shovelhead engines, giving a noticeable boost to throttle response and torque. 🔧🔥

This complete stroker flywheel kit includes a dynamically balanced flywheel assembly paired with heavy-duty connecting rods and reinforced mainshafts for reliable power delivery. It is engineered to reuse the stock cylinders, saving cost while retaining the engine's stock appearance. 🛠️

Minor crankcase and cylinder modifications are required and can be completed with common hand tools. Special pistons are required for installation and must be ordered separately—contact S&S for piston options and fitment guidance.