Every car has these lol.
The photo of the engine was taken before I did an oil change and radiator flush so those cable ties are gone and those radiator hoses and hose clamps are all new know.
When I did the radiator flush I took the top hose off the thermostat housing I found this =(
To help prevent the loud knocking sound that the older Holden V8s cooling system can suffer from, I place a short piece of pipe with a small flare at one end in the bleed hole. This forces un-aerated coolant to be picked up at the bottom of the manifold, rather than the top.