Yes, coolant is in the block, heater, hoses and radiator all the time.
Yes
There is coolant in the engine block when the engine is not running. The engine block, heater, hoses and radiator remain full when engine is not running.
On all the cars that I have worked on, it's on the front on the engine block in the center. There should be two large hoses running from your radiator that carry water. One is at the top, and one is at the bottom. Those hoses run to the water pump.
On intake manifold or engine block.
An engine block is used in cars to support the components of an engine. It is also used to transfer heat from friction to the atmosphere and engine coolant.
First of all you shouldn't be using water, you should be using engine coolant. And to answer your question, your engine will over heat and you will not be able to drive. You can do damage to your cars radiator running with no coolant.
On top of the head on some cars. In the engine block on others.
91 octane or higher it actually depends on how out your engine block gets but most cars use 87 octane, unless your car is running hotter th 200+ degrees you dont use 91 octane, your car would loose power from running to rich
Automobile water pumps are usually bolted to the engine block. ---- some cars have the pump bolted to the timing cover, Eg. ford 302
In cars, it is a barrier that surrounds the wheels. To block water and mud.
In cars and trucks the radiator is up front to get air before it can get heated by the engine.
On cars with fuel injection it is in the fuel tank. On cars with a carburetor it can but most likely is mounted on the engine block.
Cars running lean