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rofl spun bearings...
here are my 2 guesses. i'm leaning towards #2
you said your having oil pressure problems, your just getting air in the lifters and thats causing the rattle until the motor gets oil through the head.
secondly like s14 sr20's you have vvt. the vvt units tend to make noise when they get old. the unit engages at 1000 rpm. so once warm your idle will fall back to 850 and you will not hear it but every time you rev you should hear a click at the throttle body then the knock. you can also try inpluging the vvt. thats the easiest way to eliminate it as the issue.
my vvt makes noise from 1000-1300 rpm and at idle it is quite loud but it works just fine.
edit: intake cam gear as mentioned above is the same thing i am talking about b/c on an vvt motor the cam gear is the vvt unit. so like the very first post says replace it to et rid of the noise.
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