Carbon on valves

I used to see heads like that quite a bit....... not so much anymore.

I had a DOHC Neon a few years back that I ended up re-ringing....... and even on that thing the intake valves all had a big tee-pee of carbon built up on them.
However...... the ports themselves were still pretty clean.

On the Neon head, that stuff on the intake valves was really quite hard and baked on.

On the old v8 stuff, it was often softer...... more like very thick dry sludge.