Just bought gramps B back from a cousin. It has sat outside with an open exsaust for eight years! After blowing the water out of the cyls with the air hose and draining 16 quarts of water out of the drain pan, I filled each cyl with p b blaster. for eight days I hung a weight on a wrench from the pto and changed direction every morning and night with a lot of rocking in third gear. No dice still stuck. I pulled the motor and tore it down, off to the machine shop in the morning with the head, block and crank. The raidiator and water jacket had good antifreeze in it, but there are cracks between the cyl at the top of the block, I think and have had other such cracks on other blocks. the head gasket should seal the cracks and the head and head bolts should keep it from opening up when assembled but I'd like some other opinions when the machine shop would like to stitch it for only $600. All I want is the water jacket checked and the deck checked. then clean and check the crank new guides in the head and it'll be all set.