Motor Noise

[Steve]

Hi all, been reding the archives for a few hours now and still seem to be at a
bit of a loss. My 91 with 117k on it has a noise that I cant quite figure what
it is. at 3500 RPM t0 around 4500 rpm holding the throttle steady, there is a
constant rattle/knock type noise. It isnt real severe but it aint good. I did
pull the VC off and the cams look great as did the oil tubes. Had a good
friend who works on Nissans for a living (he is building a SR20DE for a 91 G20
as I write this) who said he was sure it wasnt the bottom end, but rather in
the valve train. I dont know but am getting frustrated....Any ideas at all? I
sure would like to hear them.

Steve
91 SuperBlack (rip)
91 VailWhite (sick?)
94 SuperBlack