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[Field Marshal Dr. Opti]

Surely the proof is in how the car runs despite these imperfections.

I'd just put it back together. It may run like a Swiss watch.

[minifreek]

I haven't read the full thread but I'm with Opti, Id just put it back together and see what happens....

Iv had worse than that on a Montego (yeah I know chalk and cheese but engines are engines) and it ran perfectly fine afterwards...

[Andy B]

Just to reiterate...

THIS 'WEAR' IS CLEARLY VISIBLE IN AT LEAST ONE OTHER CYLINDER BORE...

 .....

Shhhhhhh! 

[JamesV6CDX]

I polished it off as suggested, and, having turned it by hand, the marks don't seem to have come back / no new marks, so I'm going to put this down to a historic bit of carbon etc, and get on with the rebuild. I'm no longer so worried about it

I did have a think actually about what might have caused it. Some months ago when I had the inlet off for something else, I thought I dropped a backup washer into an inlet valve port. It turns out that I didn't - however in the process of looking for it, I poked about in each one of the inlet ports with a bore scope. These ports were all pretty full of carbon, so I wonder if I disturbed some, and this is what caused the marks in the cylinder.

Either way - onwards and upwards
Many thanks for all the replies

[Nick W]

I'm more interested in how it's happened? I don't recall seeing it before but then I didn't inspect the bores, and this one was close to the top before I gently spun the engine by using a hand on the pulley

Is it something that I could have done having turned one rotation by hand? Or must it have been like it before!

You can't feel it with a fingernail or finger. The car never used any oil before 

Put it back together and stop worrying.
This is what happens when you get too far into things