There are a few gaskets on a car:-
Cylinder Head, Water Pump, Inlet Manifold, Exhaust Manifold, Sump Cover,Thermostat Housing,Transmission Sump,Tappet Cover,Valley cover,Side Cover,Sump Plug,Differential Sump Plug, Transmission Sump Plug, Oil Filter, Oil Pump,Fuel Pump,
I'm sure there are more but these will get you started
Also door gaskets and window gaskets.
At least 8
There are many gaskets on any car engine. If you are asking about head gaskets, they are between the cylinder head(s) and the engine block. The cylinder head is under the valve cover. --------------
Silicone spray.
Yes.
2
Because it's leaking somewhere. Other than lines in the cooling system, head and intake manifold gaskets are a possibility.
yes, their sucking air, 65;
This answer varies by vehicle type, so please be more specific.
Only insofar as they're almost impossible to do with the engine in the car. If the engine is out, they're no worse than any other V8.
You have to check the fuel pump and the carburetor. (mainly gaskets)
Water is in your engine. Check intake and head gaskets.
check your radiator hoses and change gaskets