This shows the "shiny spot"on the intake port in the injector well, this is where the fuel is actually hitting. All the Techron or Seafoam is not going to clean up the intake runners if the fuel doesn't contact it. Dirty Ford heads look just the same with a clean spot and the rear is filthy. I have had long battles about fuel atomization and the proof is in the shiny spots. You might as well jut squirt in the fuel in a stream because a 6 pintil injector "fog" is being aimed at the side wall to roll down the long side radius to drop onto the intake valve to cool it. The mixing takes place in the cylinder with "tumble port or "swirl port" designs which is why the pistons are funny shaped.
Yes..
No?
or Old Fart you are so full of ...