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Message: [QUOTE="SFO, post: 330624, member: 21864"] Jon, when you are shopping for more cylinder head work the shop that does it for you should be able to provide... #1, Knowledge of the shim range and were the middle of it is for stem protrusion. #2, Seat pressure at closed and at full lift for your cam. #3, Assured concentricity/perpendicularity of seats to guides and how do they gauge it? #4, Free travel of valves, if the cam is not supplied the head shop needs to know how much cam you are installing, or tell you how much cam you can install. #5,What kind of machine do they use to cut/grind seats and why? Hope this helps... Bill [/QUOTE]