Yeah that's what I thought, but there's nothing there
I've got a Haynes manual VR/VS V6/V8, and it mentions nothing about a bleed valve on the V8. It has a pic of the V6 with the bleed valve on the thermo housing tho.
Stop looking for it, there is no bleed valve on the V8. Only V6 owners need to worry about it. If you want to get rid of any air try squeezing the lower radiator hose.