Is this a drag race engine? Do you make runs with no air filter? The third picture looks like dirt may have got in there as there are numerous vertical scratches in that cylinder wall.
No its a street engine and i belive it comes from the pretty ruff cross hatch when the rings be brooken in and material from the cross hatch edges, just a theory, anyway i did a leak down test and all cylinders show 6-7% so i belive its all good and its looks bader than it really is with the camera angle, light, zoom etc.
