and most importantly... the combustion chamber! Pay special attention to the valve seats! Freaking beautiful.
I am going to spend time removing the residue from headgasket and intake/exhaust gaskets, but you get the idea.
This head had 180,000+ miles of daily driving. It was formerly in a homemade turbocharged E34... the kid I bought it from said he never head detonation since he was running 7 or 8 psi on a T3, and now I 100% believe him!