Mark goes all the way to top of bore-happened when piston assembly was put into the cylinder. most likely from overlapping/improperly spaced oil rings or if a stroker motor needing a oil ring spacer across the wrist pin hole could be that. bevel at top of bore looks good but cross hatch lines look like it was honed with a hand drill?????hone pattern looks sporatic in every pic.

Does this shop have a Sunnen CK10 type hone or what do they use for bore/hone operations--------also did they balance the assembly????