I have a 2006 vintage LT1042. The model number is 13AX11CG710 and the serial number is 1J236H10462. The single cylinder Kohler Courage is a KH-SV590-0003 and the block is cracked due to the closure plate bolts coming loose. I retorqued them a few months ago but now the crack is apparent. I'd like to look into putting a different engine on this mower. Last year when I replaced the drive belt, I saw that there were several different mounting holes. Does anyone know of a better engine that will fit in the mower? I would be comfortable with a fair amount of tinkering, rewiring, fabrication, etc if I could find one with the right shaft that would fit under the hood.