Well I managed to fix this problem:
Rattle noise under acceleration
I took the lower inspection plate off the auto, and revved her up and no noise!!! So my only thoughts is that the bolt heads were making contact with the inspection plate when the revs increased(maybe suction from the torque converter or a bit of warping... dunno). Couldn't see any real big scrape marks on the inspection plate though, but I'm pretty sure that was it.
Now my next problem!! Seeing that I can rev her up really high now(in park and neutral at least) because the rattle noise is gone I've encountered a new problem!
I put the pedal down and what I end up with around 4000RPM+ is the motor backfiring through the exhaust like all shit. The motor was cold when I was doing it, and I know thats technically bad, but surely it shouldn't be backfiring heaps. I did get a 2.5" straight through zorst only a week ago, so I dunno if these type of noises are normal. It sounds like a V8 super car on the brakes, when it should sound like a i6 on the throttle I'm thinking :|
I'm thinking the cam gear is a tooth out, as I have done work on the motor and set the cam position as best I could. How many teeth forwards and backwards can the cam be put before contact with the piston and valves occur? I want to play with the cam timing, but i'm too afraid of the damage that may result.
Any ideas on my backfiring or the cam timing issues?