Thanks for the reply guys, it's a B18C2 that will be seeing probably around 8500-8700RPM.

Although looking back at my work, I think I'll need to do it again with a new set of rings as my technique was not perfect.. it's my first time filing rings so I'm not surprised.

I understand I am supposed to file INWARD (handle rotates counter-clockwise), and only file one side - allowing me to use the other side as a reference to ensure that the gap is square. These things I was not aware of.

Also, on this topic, I've coated the cylinder walls with engine oil and am using a piston to push the rings down square, and am drawing them out using my hands to keep them level as they come out, but no matter what it always seems to make light scratches on the walls. I am deburring the rings with 800 grit sandpaper each time as well.

the scratches are very light, by this I mean I cannot catch my fingernail on them, they are only visible. So my question is, will this hurt anything?

I'm confident in my capabilities but this is all new territory to me and it's pretty stressful without any help..