Re: i have a knocking sound rom the engin
You can take the oil pan of with the engine in place, but you will need to remove the starter motor, Y-pipe and structural cover (the one between engine and transmission). For removing the Y-pipe you only have to turn the bolts, the nuts have a locking tab which prevent them from turning. Some PB blaster or alike on the nuts will ease the job.
I removed the pan on mine when i had the transmission down and i can tell you it was quite a job to get the pan of. There is an oil pan gasket which forms one piece with a windage tray and it is mounted with three bolts to the engine (together with the oil pick-up tube). So if you use some pry tool, only use it between the pan and the gasket. When i finally had the pan of, the gasket was not useable anymore. So i would advice to buy a new gasket/windage tray before you start opening it up.
I didn´t go through the previous posts, but did you measure the oil pressure? The knock and pits on the cams point to an oil delivery problem. When i took my pan of to check the oil pick-up screen, i found a piece of aluminum foil in it (most probably from an oil bottle seal).