Piston is 4 3/4 diameter. 14 center of wrist pin to center of main. Most of my item are old and I will try to do my best to give an accurate description. This item is in the category “Business & Industrial\Light Equipment & Tools\Stationary Engines\Parts”. The seller is “tonyaron29″ and is located in this country: US. This item can be shipped to North, South, or Latin America, all countries in Europe.