It seem that the issue of installing hardened valve seats, is one of the most controversial discussions that I have been following on this sight. For as many people swear by them, the same number believe that hardened seats are not a good idea. I understand that some of the replacement seats are no better than what is removed... and that the seats are only going to be as good as the shop that installs them. I have read about how great Stelite seats are, but also horror stories about valve seats comming loose, and potentially destroying a new engine. Some believe that they interfere with the heat disapation in the heads. It seems that for every "expert" who favors hardened seats, you will find an article by another "expert", who strongly discourages using hardened seats. Some say that you will destroy the exhaust seats in no time, if you dont install them. Others say that they have been running their high RPM engine for ever, without hard seats, without a hitch. I have read that you only need them in engines that are used hard, for towing, racing and such. Those who believe in them, swear that they should be installed on every motor that doesnt have them. It seems that after following this subject for the last two years, its still just as confusing to me as to what is best, seats...or no seats????