Intake.004-.006
Exhaust .006-.008
These are the tolerances in the book. Definitely want to set to the high side for long range. I bought the gaskets from Skydoc and got to use his shim kit. I recommend doing similar, by having a variety of shims you can change each one as you get to it instead of checking and recording all 16 and then going back thru to switch around. I needed two shims not in his kit so had to wait a few days to finish but it but it went much easier than I anticipated. I printed the instructions from the read only library, got Skydoc's kit, and another member sent me the shims I needed, so with the help of VR I got the job done. With 43-44k miles I had several on the low side of tolerance with none being critical. I took the time to push them all to nearly full gap so should be good for a long time. I'm with the others if you're almost to the valves invest a little more time if for no more than peace of mind.