Had a rocker stud pull and I’m going to get my heads machined for screw in studs. Pulled the heads and thought the cylinders were shined up more than I thought they should. It’s a mild 327, fully rebuilt 2500 miles ago. Is this normal wear? The diesels I work on for a living would still have like new cross hatch after 2-3000 hours. But I’m not experienced with older gas engines, I just expected it to look new still. It’s hard to get a good picture so hopefully good enough .
Was the cross-hatching evident when you got it back from the re-builder or was it completely re-assembled when you got it back?
I have seen that when block was not cleaned well enough after shop work . Grit from honing and /or molly rings . Might want to pull pistons and crank and ball hone clean and put back together
Don’t worry, it will be fine. I still see cross-hatching. The diesels that you and I work on have different piston ring packages and have to withstand a lot more heavy use than car engines. I would also guess that our cylinder liners have a higher nickel content in the iron. Sent from my iPhone using The H.A.M.B. mobile app
I agree that it looks normal, sometimes we make this old car stuff way to complicated Sent from my iPhone using H.A.M.B.
I'd say that is a LOT of wear for 2500 miles, should not be typical. Polishing like that is usually the result of carbon deposits in and around the ring grooves and lands, restricting free movement of the rings in the grooves, and that usually takes a lot more than 2500 miles.
Doesn't look bad. Fingernail test it. If those 'score' marks are more prominent than the cross hatch you might want to verify clearances. Otherwise its most likely just an artifact being it is on the thrust surfaces and not anywhere else on the bore. Albeit if you look at the cylinders perpendicular you will see similar marks on the sidewalls. Look for any polished smooth areas, that would be more indicative of wash down.
In a lot of places in those pictures it appears to me that the cross hatch marks go over the vertical scuff marks.