I certainly appreciate your recommendation if I was to try it at home. Now I'm feeling a little in purgatory. Well I have a few dollars to take them to the shop to have them checked out to maybe staple a receipt to the slip of paper that says to check them out to keep any warranty valid. Both of the shops that I paid good money too and have done good work for me have both recommended not touching these heads. So they are out... For my hour of shop time it doesn't even sound like someone will even clean them up for me let alone Test spring rates do any shimming or anyting. No lapping valves or anything..