[DeTomaso] Adjusting Hydraulic Lifters

[MyCars]

My car is making a lot of rattling (clickedy clack) noise in the area of
my valve covers, this noise quiets down as the engine warms up.

I've been told that I need to adjust my valves. Can someone explain how
this is done, or point me to some instructions on how to accomplish
this. If there is somebody in the Seattle (Kent) area that has time to
mentor me through this, that would also be greatly appreciated.

I am using the Crower 15242 hydraulic camshaft.