not much of a crack, just make sure you dont overheat and there probably wont be a problem for a very long time. I've had much bigger cracks on that on engines that ran perfect.

8 Starion SHP, 87 mitsubishi van, , 81 galant g54bt, 78 lancer g54bt, 1965 Mitsubishi Debonair Deluxe
87 swb montero offroad pkg goin g54bt with sr locker 33x12.5 dual bouncy.