This is actually a follow up to a previous post where I was replacing head gaskets, thermostats, etc.. Before moving forward I wanted to get some advice on the following:<br />1) While cleaning the heads up last night I noticed (on one of them) on the very bottom, in between two bottom bolts where the water journal that flow around the head, you have a cavity between the two bolts. That cavity is corroded to the point its not as thick and not as true of a surface as the rest of the head, by the water journal. The corrosion is actually not on the water journal side but the side of the cavity between the two head bolts. A friend was over while I was working on this and he suggested marine tex to build it back up if I wanted to, as it looked to be on a side that is just an empty void. ??? <br />(2) I removed the inner exhaust cover so that I could inspect the rings, etc.. All looks good, pistons, cylinder walls and rings. I do have some minor corrosion on the inner exhaust cover along with carbon build up. The corrosion was on the same side that I thought was breached.. (Although I never lost compression, it was the gaskets that looked suspicious to me.) Should I just clean it up and put it back in, or do I replace it?<br /><br />Thanks in advance!<br /><br />Fred