I have seen as high as 300F at oil pan temp in a stock LS7 on track days,not saying what is right or wrong but went the whole summer like that then pulled the engine to inspect and bearings were like new using 15W50 mobil 1. I know bearing clearances and type of bearings are different In a LS7...
Mine is putting down 689 hp and 680tq When the tires are up to temp and good road conditions you can almost mash it in 1st gear with a Ricardo. It really hooks and moves!!!!!