Hi Dennis,
This is a 6 year old thread. A few of the folks that were involved on the thread have not been active for awhile.
What apm motorsports said was:
"If you keep getting oil by #3 header, just under valve cover, u have a crack in the chain journal. they tend to create a hairline crack. some guys repair with jb weld best to alum weld it".
I added a bit of punctuation so that it create sentences. lol!
So what you are asking is: "Can the cover be welded before it may crack, as a precaution"?
I don't see why you couldn't. If the area is suspect; Why not try to strengthen it.
Steve