basman.. hello there.. i also have this engine on the alpha and its great...not sure which engine you have..i think i read somewhere that the one on the alpha is classed as a .45and the new one that is sold by itself is more like the .46 put out by O.S. ...love the engine...i have been using 10x6 and 11x6 on it like the 10x6 better...anywho thats my story..spooner