The Faito Racing crankshaft jack up stroker kit will increase your cylinder up/down stroke by 10mm (+5mm up/down) from stock 48.8mm to 58.8mm. Heavier than the standard unit and balanced for minimal vibration. Forged connecting rod is included to fit the original sized pins. Best used with or if you already have a big bore cylinder kit and cams installed. Professional installation is highly recommended for this item!