I did a search on this and seen some info already. I am having to assume that all this mess started sometime in 1999?. I have a 98 TJ, and I am having a hard time finding the casting number on the head (I read drivers side approx # 3/4 cyl on side of the head). Well the last owner had a new exhaust manifold pu on it, so maybe the gasket is hiding these numbers. Is it viewed looking from the side or top looking down? i should see like 0330 if I have a non-affected (potential) head?