Rocker cover

At least 2 cylinders, and "now",lead to the inevitable question; Are you sure you got the firing order right; 1-5-3-6-2-4?

Ten and twenty is right hot. But by the time you get everything off things have usually cooled off considerably.
I set mine cold,to twelve and twenty-three at a summertime temp of about 75*F.Seems pretty good to me.Years ago in the mid 90s I set them like that, then got er warmed up, ripped the top as fast as I could and rechecked the lash. Ten and twenty was about what I found. So the 12/23 been my standard ever since.
At one time I experimented with a tighter exhaust lash,going down to .018 cold, with no appreciable difference.So back it went.Shes pushing more than 400,000KMs now,that would be more than 250,000miles.
I cant say to A/C but on mine the alt has to pretty much be removed.I can do the job with it loosened and flipped but its a real chore, so I just spin the bolts out and lay it aside.