AlC1

I’m currently doing the timing belt, water pump service on my 05 LS430. I notice a little seepage from the vct sprocket. My question is do the valve covers need to come off to replace the cam seals? Or can I access the seals by removing the vvt sprockets? Also, does anyone know the torque specs for the the various bolts and nuts when doing the timing belt, water pump? Thanks in advance!