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i'm no expert, but that latest round of pics of the scratch seems pretty damning. if that scratch is as deep and wide all the way down as it is at the top of the cylinder then i doubt you will get anything for compression, will get a tremendous amount of blowby into the crankcase, and lots of oil into the combustion chamber (which appears to be happening given how dank the top of your piston looks).
dunno why you took the engine apart in the first place so can't really correlate cause to effect, but did you send these latest images of the scratch to lee jenkins? i'd agree with him if all he was working with was the initial images which look more like bore polishing than bore scoring, but the scratch seems a bit more than all that.
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