I removed the head and noticed that #2 piston looked dry and sooty on the top of the pistons and the other ones looked slightly wet from gas and oil. Is this normal for one to look different?
Obviously something is wrong. All should look the same. Why did you remove the head?
Had broken magnets plates so I removed the engine and figured this was a good time to go through it.
Looking only through the spark plug holes, I have 2 pistons, dry and barely sooty. The other 2 are oily / gunky / not great looking. And the biggest concern - a little gelled green globs in one of the dirty ones (anti-freeze green). Head bolts weren't very tight so I re-torqued to 45 ft/lbs (per forum comments for Alum Z head). I haven't had a chance to restart the car because of a few other issues I'm chasing down. I'm hopeful the messy pistons were just due to loose bolts.
Please post what happens on your project. I'm learning all the time and hope that it might help me sort out my issue.
#2 might have had a misfire, leaving behind soot from an overly rich mixture. Check out the valves and other things while you're in there. If you don't find any particular problems I wouldn't worry about it. Especially if the car has been running really well.