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I used to use a razor blade glass scraper for the easy stuff. Then 3m synthetic steel wool pads for the rest.

Just a flesh wound, she’ll be right! (The legacy). Glad to see the coupe coming along. Looks like a top job done on the repair work. Cheers Bennie

The shadow at 5 o-clock means nothing really. The "skirt" doesn't come up that far..... whoever you talked with is talking out their a$$ and has no experience with Subaru engines. The cylinders look fine. Put rings in it and call it good. If there is piston skirt scuffing then send me the pistons for knurling. Every EJ turbo we build has forged pistons and they fit quite loose and "slap" when cold. Doesn't have any real effect and they still don't burn oil. GD

Those coins also means the head hasn’t over heated since the last work was done. They’re there as a warranty on their work. Over heat the heads and the coins fall off. Cheers Bennie

NPR rings are better than OEM Subaru rings?

Yes. If there is no evidence of metal in the pan or in the filter (cut it), then just get new rings. NPR Japanese rings are a good choice. Make sure you check the end gaps. DO NOT HONE. Do not touch the cylinder walls. GD