This is the replacement crancase for the 70SZ-H. / This is from O.S. Engines. / / FEATURES: Aluminum construction / / INCLUDES: One replacement crankcase / / REQUIRES: Installation of components to rebuild a 70SZ-H engine / SPECS: Length:3.053"/77.3mm / Width: 1.677/46.2mm without mounting flanges 2.4"?69.6mm with flanges / Height:3.289"/ 83.5mm / Diameter of carb throat: .720"/ 18.9mm