[mgarblik]

I have seen allot of Pontiac engine failures over the last 40+ years but NEVER a failure on the #5 main bearing alone. That is a bizarre failure and I am sorry you had to be the one to have it happen. I am also sorry to hear a Scat forged crank may be the cause because I am building an engine with one as well. Disappointing situation for sure but it looks like you have a good shop dealing with it and it will be corrected.

From the few pics provided, it looks like the oil slinger area and the radius is the problem. It looks like the slinger is not riding in the center of the groove and has little radius. If it was rubbing in the block or cap that would make allot of heat and ferrous debris quickly..