Freeze Plug Sludge

the plug over the starter and in that same corner between the motor and trans is where that crap always seems to collect in small blocks... always change the plugs when you have the motor out. i wouldn't worry too much about it but i would flush it out as best you can.. maybe run some cleaner through it or use a flush kit on it. ya don't want it breaking loose wheil driving and clogging the rad..