I just did a valve adjust on Saturday on my '05 project and found a different method that was more accurate and efficient for me. Here's the routine.
Don't leave the guages all tied together. Set feeler gauges out in order from .005 in. to .009 in., and keep them in order as you work. I put mine on a small rolling table that I keep next to me on which ever side I'm working.
I use the starter button bump method to rotate the camshafts where they need to be. This avoids pulling the timing cover and maybe needing a new gasket.
Feeler gauges have a 'custom' 45 degree bend about ~1/2" long at one end of each gauge. First use them individually to get an idea of where things are at before loosening anything. Not that concerned with dual gauge readings at this point.
Loosen both adjuster screws on the rocker in question. Lay the longer flat part of the gauge underneath BOTH valve adjusters on that same rocker.
Its a bit of a touch thing, but I got to where I could screw the adjusters down onto the gauage at just the right tension, then tighten the locknut to get at the right clearance. I use the gauge for the middle of each range for exhaust (.008 in.) and intake (.006 in.).
After hand tightening the adjuster nuts back down, remove the feeler gauge and double check with the bent tab end for a single gauge go / no-go check. If its good, torque the nuts to spec and do a go / no-go check to verify nothing moved.
This works well for me and takes about 20 minutes to do the actual valve check and adjust. Don't worry about the time. Don't be in a hurry and stay focused on being thorough and methodical.
Here's some files I use to help me keep my work straight. I fill the worksheet out as I go.
Feel free to use any of them if you like:
PDF ChecklistXLS ChecklistPDF WorksheetXLS Checklist - shows one of my valve adjustments as an example.
You can call up the PDF's and print them for use or save them to your PC.
If you save the XLS files to your PC, you can edit them as needed. There's a template to add additional valve adjustments to the sheet to allow you to keep a running record if you want.