Dropped a set of 360 J heads off at my machinist broke them down found 3 cracks all on spark plug threads running in the direction of the intake seats only one runs into the actual seat, machinist says they (the other two)are not deep and can probably be blended there is a small ridge between the plug well and the seat this is where the beginning of the cracks are.Hate to give up these heads as they are in good condition except for the cracking,anyone run into this before if so what's a good fix.Should I just press in a new seat?
