Wow.. sorry for the lackadaisical response... didn't know it would get any kind of response... I was just poking at Matt with that post up top, because I specifically talked to him about this and it is a problem he has had in the past, like he mentioned. I have had this happen on a SR with hydraulics, mild 264's and supertechs, ferrea duals and jun duals. Again.. very different scenarios here from Mark's.. these were daily drivers that had valve seat issues after 40-50K miles past the swap/upgrades performed. I have done probably no less than a 100 SR valve spring jobs, which Matt can attest to, over the years and I do have a couple that stand out in my head because of the later complications.

Martin