[Walt Dupont--Me.]

At this stage of the game you'll have to pull the head and remove the valve and see if you can see where it's leaking. Chances are the crack goes down the port some. I've cut in 100's of seats in every brand of engine you can think of. If you have to install a larger seat for some reason I've cut into the water before. If it's just a little cut usually green lock tight and drive the seat in will seal it. Let us know how you make out. Walt