BRAND NEW PART # 910-0625 FOR 107″ MODELS INCREASES DISPLACEMENT TO 124″ The Big Bore kit yields excellent results with stock cylinder heads Easy installation: no need to bore or split existing cases, just swap the cylinders (unless otherwise noted) Cylinders are constructed from premium aluminum castings with cast-in iron liners Kits include cylinders, pistons, rings and gaskets (head, base and exhaust) Black or silver powder-coat finish Made in the U.S.A. This project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications. BORE SIZE 4.250″ DISPLACEMENT 124″ STROKE LENGTH 4-3/8″ COMPRESSION RATIO 11.0:1