Well they had the head off recently and didn't notice the scratch. Could be the piston had it covered, (mostly) and they didn't see it. Could be that a little bit of foreign metal got in there like a wee small corner broke off a gasket scraper. He stated they drove it for a while. Long enough to make a real good scratch. I'd be surprised if the next compression check doesn't show it. And then to go through all the work of R&R that mean head to replace the valve seals. Sounds like he didn't read a service manual on it.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!