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Larger bore than stroke length is called over square and is usually high revving. Bore and stroke the same is called a square engine. Smaller bore than the stroke is called under square an is usually considered to be a higher torque engine.

A ball hone can be used to plateau your existing hone pattern and achieve a finer finish.

I pretty much stick to a file card for cleaning my files. If I'm going to file soft metals, I load the file up with chalk before filing.

I agree with every thing Jennifer said. I worked my whole career as an automotive machinist and that was how we did it. A very tiny valve ,if there is enough margin, you can cut a groove across the head of the valve and use a screw driver as a lapping tool.