What are my options. We fired up a 40 over 440 on a run stand yesterday and noticed the cooling system pressurized somewhat. I capped it and was able to run it for a very short time about a 2 minutes and shut it down. I pulled the dip stick and found water starting to mix with the oil. This morning I pulled the heads and found where the cometic gasket flares out on the lower sides water was getting passed the sleave and I'm sure it puts pressure to the cooling system on the compression stroke. It is a 40 over gasket and actually sealed right on top of the sleave except where they flair out. Is there such a thing as a round head gasket? Any other ideas? New block?