First thing, that was me referring to the 305 in my other vehicle. Not the OP. if a $70 whole engine gasket set and my own time and labor is "a waste of money" on a good running engine that needs nothing else, then I must be some special sort of A-hole that likes an engine that doesn't leak oil or smoke due to bad valve stem seals.. Second thing, take notice how everyone in this thread has been posting responses that are CONSTRUCTIVE or HELPFUL. That is until you came along and interjected your opinion, which is neither constructive, nor does it have anything to do the point of this thread. Uncle Grimace - great info, thanks for sharing that. Definitely helped me decide which seal/material I'm going to use.