well I just yanked my motor apart 2 weeks ago, a 98 7.4, and they did not look like any fel pros that I have ever seen. with only 120 hrs on it I would leave them alone. I run mine in salt every time and wash it out well, I really looked at the head gaskets when I pulled them off and found no problems what so ever. Merc seems to do a good job, so much so that I wouldnt think twice about pro charging with the originals. but valve springs, well those I would change!