pitting/holes in cyinder wall

I am not an expert.

but I don't see ANYTHING for a cross hatch there, and I think I see what looks to be specs from detonation.

Post a better picture

I agree with socket. Just looks like detonation marks. I think your good

There appears to be a small amount of detonation marks at very top ridge, but the dark pits a little lower in the bore under the combustion ring are just porosity pits from the original casting. Those are nothing to worry about, but the lighter specks further down near the transfer ports are too blurry to make out from the photo. I think they are also just porosity pits that are catching the light and shining, but not 100% about that.

From Millennium Technologies website -

Porosity is gas trapped in the base metal aluminum during casting. These “holes” are exposed when the cylinder is machined or subjected to various chemicals in the plating process. The pits are usually small in size, and in good castings few and far between. When kept under acceptable levels, porosity will not adversely affect the performance or longevity of the engine. In fact, it will improve lubrication. The pits will not cause the coating to peel, nor will a ring hook on them. As far as our specifications on porosity, our cylinders carry a lifetime warranty against defects in materials and workmanship. Therefore, through extensive testing we have found that porosity is a cosmetic problem only. In our pursuit to have both cosmetic and functional perfection we do everything possible to remove these pits. In some cases this is not possible, so we release the cylinder only in cases where it will not affect performance

If it is really alot better at the base you might want to check the bore at a few heights. The bottom tends to wear a little more which might smooth the pores out a but. Unfortunately excessive wear will create piston slap which will break skirts. It is ok if it is worn evenly as long as it has the proper piston size in it, but when it starts to get a big taper it causes problems.

Use a bore gauge and they are not cheap, unless you have a CMM then use that. And yes those are pits from the casting, not from wear, but I always check my cylinder for out of roundness and check the piston for cylinder wall to piston clearance. Measure the piston with a mic at the widest part on the skirt. The piston should come with instructions on wear to measure it and what the clearance should be. That piston looks like a Wiseco which is forged and the clearance would be about .002". Measure the cylinder bore front to back, side to side, both top and bottom.