This particular engine hasn't even seen any water beside hose water. I just built it and put it in the boat, the risers are off the old engine that blew up. This is a fresh build, you can still see the cross hatch from being bored over. Idk how water would just get in 1 & 7. I'm going to test the risers with some pressure, that's all I can think it is. It was not leaking in the boat, I assembled the other side that isn't leaking the exact same way and it isn't leaking