Are these the new Mopar heads or the older ones that look like the old A990 heads? If they are the older ones, they are notorious for having problems.

After suffering through a year of using an excessive amount of oil, it turns out that all 16 guides had excessive clearance. Also, they have been known to drop seats. This usually shows up either when they are first run on the dyno or after a few miles. I spoke to Tim at FHO about this and he confirmed the problems with these heads.

I'd get them off and go through them pretty thoroughly.