You ran the LT5 without the cam cover on?

I'm no expert, but you
don't want to do that again, as the cam covers more or less act as bearings to keep your camshafts from flying off of the heads.
The cam covers are l/r, and matched to the heads anyway, so swapping them isn't an option. Jeff, Johnny, or one of the other more knowledgable guys can chime in here.....