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Message: [QUOTE="IdahoF350, post: 1421506, member: 2989"] You've got plenty of replies, but more can't hurt. If the scratches catch your fingernail or a dental pick, it should go to a machinist. If they don't, it's not abnormal to have visual lines of travel in the bore. Keep in mind, the crosshatch causes the rings to spin, but the pistons are fixed (non-rotating, only reciprocating). You said you re-honed as soon as you noticed the marks during assembly. Did you power hone or do it by hand? Does your machinist use a plateau hone (or finishing brush) to remove the sharp peaks left from the honing stones? Did you do the same when you re-honed? Also, motor oil on piston skirts and rings relays break in or ring seating by glazing the cylinder walls on initial start up. There isn't enough heat in the combustion process even on a diesel on initial startup of a new engine and that oil turns to carbon and fills the valleys of the hone crosshatches. It can take several thousand miles to get enough heat into the glazed oil to remove it and allow the rings proper lubrication and proper ring seating. I've used WD40 for 15 years, Total Seal has a dry powder lubricant for their rings, and you may get some other engine builders to chime in on their preference, but using motor oil just slows the break-in process and makes you wonder why you consume oil for a while. Point being, proper cylinder finish, and correct assembly lubricant, and you'll seat the rings with minimal wear in the first hour of run time, just like the latest engines from the factory. [/QUOTE]