Reply to thread

Maybe that one hasnt been around in enough numbers,  but I have yet to hear of a 450 which has valve related short time issues.  Hard to get away from OE for me if that is the case.   I have the hardest time going to a valve spring with higher tensions,  for the load it places elsewhere.   I don't think you feel the softening of your low or midrange power on the 450 but the wear factor would be a consideration for me.