OP what oil filter are you using? I'm curious to see if this is Oil filter related -I know the PF64 has more holes on it than the UPF48R. I know on another thread there is a comparison between these two filters and just appearance tells me that the PF64 is less restrictive. Or could be nothing.
Edit: see post #31 for oil filter pics:
http://www.camaro5.com/forums/showth...ht=pf64&page=2