I'm with you on this one.well my self i like firing order and if you do it cold and have a iron block with aluminum heads -4 on valve lash but always check hot and cold to see what your set changes to from hot to cold for your own reference point ever motor is a little different
I've been using -.006 on iron block, alum. headed BB Chevs for years, and it never fails. One thing to remember...a thou one way or the other isn't critical. Each person has their own "feel", but what is critical is consistency from cyl. to cyl. I agree on establishing your own correction for cold lash for consistency, but once you get it down, you should be able to run the valves in a matter of minutes.Like others have said, cold is the best method. If you are not familiar with expansion rates, you'll have to figure out that cold setting yourself.
If you adjust "hot", by the time you've started adjusting the first to the last, the engine has cooled some and your lash settings will be different. Don't believe it? Try it. After you have finished the last one, go back and check the first one.............seems tight doesn't it? Or maybe the last ones are loose?
Get the engine to operating temperature and adjust the intake and exhaust rocker on cylinder #1 as per hot setting spec........come back to it a few hours later or the next day and merely measure at #1 intake and exhaust. This will be your true cold spec. It helps to be in a temp controlled environment also. They will measure tighter at 40 degree temps than 70 degree so be consistent.
The cold setting will render the same setting for each cylinder every time.