there is a very soft engine head ok but I understand why these gaskets fail and with Intex this sharp twist in the exhaust port and weld that should be on the outside of the flange. not the inner stash, gets very hot, they get hot, in other words, I kept cooking. So I sanded some, sanded the exhaust pipe and re-welded it much better on the outside, installed a new head gasket and kicked it out the door.