my did the same thing loose arp bolts on the flexplate

 

I know its not piston slap, because its separate from that sound. And much louder.

 

Which bolts did you use?

 

That was it. All fixed!

http://www.youtube.com/watch?v=QgkIB41eFYU

 

Holy cow!!!! That's scary!!! You make me want to take mine apart and check stuff!!!!

I know I'm being paranoid because I used the GM bolts and their torque sequence so I should be fine.

Glad you found your problem before it was too late, I would hate to try to get sheared off bolts out of the crank!

 

Thats the thing, everything was torqued properly. Problem was the threads didn't go all the way to the head of the bolt, so the flexplate wasn't tighten all the way down.

But ya, broken flexplate won't have been fun

 

Thanks for posting that vid, and Im glad you got it. I was gonna suggest something like the starter gear hanging in there or something, from your first vid I thought it was something at the back like starter related or flexplate related.