I just recently rebuilt a set of heads...cleaned all parts and and after re-assembly noticed the exhaust valves seemed not as tight under the retainer as the intakes........the installed heights are all the same.....is this common...i did however discard the exhaust valve rotators...having never rebuilt a head that had them.....My valves are all the same height as well as the springs.....these were stock 416's with 1.84" intakes and 1.5" exhausts.....maybe i am just paranoid a little....did use moly lube on all parts but just want to check with you guys and get your advice......cam has .471" lift.....hard to explain...most likely some one on here will know what im talking about.