Well, its taken forever to get this sucker out and find out what the problem was. I was a little bummed with the engine going south so I just let the K5 sit in the garage and started to play with the Trans Am (untill I blew that engine up). Needless to say, it's been a bad year for engines. This engine was also the 5th to let go. Who holds the record for the most engines installed anyway??? /forums/images/graemlins/wink.gif K5 engine history: 1st- 350 stock, not enough power... 2nd- 383 sbc, lost pickup tube and pressure, no gauge 3rd- Used 454, lost mains 4th- Reman 454, not enough power for a BBC 5th- Stroked 496, lost rod bearing 6th- 540 coming soon... The 496 was making a loud knocking noise along with loud squeeking. /forums/images/graemlins/confused.gif Metal shavings in the oil big time. I was pretty sure it was a bearing. Sure enough, tour the engine apart and found #5 with a trashed bearing. Next to it, #6 didn't look that great either. Normal bearing on left, #6 in the middle, and #5 on the right: Crank: Few of the mains were scored a little. Looks like metal shavings went through all the mains, I'm not sure what caused this but I think it may be from the piston rings not being set correctly. The engine shop screwed that up and now I have grooves in my cylinder walls. I'm thinking the metal shavings from that could of destoyed that bearing. What do you guys think?