I have Briggs & Stratton 12hp I/C engine on a small 32" walk behind. It is just over 2 years old. today after starting it and running for about 5 minutes a section of the engine block about 1 1/2" by 2" broke out!! It is past its warranty and the place I bought it at has since closed. First does anyone have any ideas on what happened and next is there a good place to buy a repacement engine? The part of the cast aluminum case that broke was only 1/16" thick. Which seems awful thin. If anyone has any ideas on where i should go from here it would be appreciated.