The REVOLUTION PERFORMANCE, LLC Forged Piston Kit is a precision‑engineered top‑end solution for 98 cu in. big‑bore cylinder kits. Each kit features a domed piston head matched to a 3.937 in. bore and a 4.000 in. stroke, delivering a 10.3:1 compression ratio that is tuned for street‑oriented performance. Constructed from forged aluminum, the pistons provide the strength and dimensional stability required for high‑rpm operation while maintaining the lightweight characteristics essential to responsive handling.
Designed as a complete, bolt‑together unit, the kit integrates seamlessly with twin‑cam configurations and is offered in multiple part numbers to accommodate a range of cylinder sizes and dome variations. Whether installed on a 98 cu in. or paired with larger displacement options, the kit delivers consistent combustion efficiency and durability for riders who demand reliable power delivery in street environments.