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Don't quote me on this, but the 99-00 shared the same camshaft as the 4.8 and 5.3 which was a 190/191. I know for a fact that the LQ9 uses a 196/207 cam and has orange LS6 style springs. I would bet that the 01+ LQ4 also uses the 196/207 cam.
The couple LQ9's i've taken apart had regular springs not LS6.