I got these scuff marks on the journals of my crank I took a picture of one. I can see them visibly but they feel just as smooth as the rest of the journal. I'm just wondering if they will be a problem?

 

what kind of application?(DD, race only?) for your daily driver if you dont feel anything with your fingrnail install and go. for a race app just have it repolished.

 

weekend driver and the once in awhile race.

 

I'd leave it.
If you want, try to find some 1000grit emery cloth, and lube it with ATF and give it a quick polish.

 

I also think youll be fine

 

Doesn't look like much to be worried about. Polish it if you want.

 

All I could find at ACE was 1500 grit it jumped from 600 to 1500... So I got the 1500. Should I just sand the spots or all of the journal?

 

do like mentioned about the trany fluid but wrap the cloth completely around the journal, take a shoelace with a single wrap around that and spin buff by alternating string pulls.

 

Chances are you'll be just fine, even without any additional polishing. I put some slight nicks in my crank trying to remove it with the pistons/rods still in the motor. I took the crank to the machine shop to have it polished again. They put it on a lathe and spent all of 5 minutes with some emery to polish it back up. When he got done, I could still see some slight marks from the nicks, but nothing you could catch a nail on. I asked if it would be a concern, and my machinist said it'll be just fine. Your "scuff" marks are a lot less visible than the nick marks on my crank, so you shouldn't have any problems. The bearings are a lot softer than the crank journals, and they'll conform to slight irregularities without causing any harm. In fact, if you use the new bi-metal, alecular alloy engine bearings that King and Federal-Mogul offer, they actually claim these bearings can polish the journals, and have fantastic embeddability as well. After reading about these bearings, I replaced the Clevite 77's with the Federal-Mogul bearings when I re-installed the crank.