GM LS piston pin oiling

[PLohr]

Hello,
I have a GM LS engine apart (2008 L92 6.2 liter) which has seen about 200K miles of normal driving with some towing. The wrist pins have a blue streak along where the connecting rod bushing edges ride. Usually only on one side of the con rod bushing. I assume the blue streaks mean the piston pins are seeing a good bit more heat at the edge of the con rod bushing. The Wrist Pin Photos below show one example. All of the wrist pins have at least one blue streak.

The engine was running well but was taken apart for a rebuild. None of the pins were noticeably loose in the con rod bushing. I measured the clearance of one pin / con rod bushing and came up with 0.0006" (GM says upper clearance limit is 0.00078" so this is still within tolerance).

The engine is being rebuilt so the wrist pins will be replaced. The bushings in the connecting rods will be replaced or new connecting rods will be used. The engine will see the same type of usage as before - normal driving use plus a little towing.

The blue streaks wouldn't seem to be a major issue but I'd like to make an improvement here if it makes sense. Should I be looking for ways to improve the oiling at the piston pin / connecting rod bushing?

Could it be helpful to relieve the connecting rod bushing edges a little?

Wrist Pin Photos:

https://photos.app.goo.gl/obg5abgYo693RVxQ7

https://photos.app.goo.gl/f2XDPuKfkDBNbqMZ8

Connecting Rod Bushing Photos:

https://photos.app.goo.gl/CTy2sNcVpgf2Ckpr7

https://photos.app.goo.gl/RwKqSeQ2thrC2Cuy8

https://photos.app.goo.gl/1HWKR4pDVqhHd2vi6

https://photos.app.goo.gl/qj8cyhZa1N1D28Hv8

Thank you for any help,
Paul Lohr

[Newold1]

Paul, if you rebuild your engine and after 200K miles your wrist pins and bushing look like yours in the pics. You've done an incredible job and used great oil and oil changes! Those pins and piston pin areas look just fine for 200K!