Here are some pics of my old engine's internals. It lived on SuperTech for a long time, then a few changes of Royal Purple, then Mobil1 0w-30 until the last couple of years when I started using whatever synthetic was on sale at work.
Piston tops:
Valvetrain:
Combustion chambers, note burned valve on #3:
Piston tops:
Valvetrain:
Combustion chambers, note burned valve on #3: