I actually have two questions. First I'm replacing my radiator and flushed the system and drain most of the system's water. Still I'm sure the block has some water in it. About how much water does the block store? The second question is about air pumps. I have had a tick in my car all summer. I replaced the exhaust manifolds still there, adjusted valves, still there.I was about to just give up but i noticed something. when taking off my belts I spun the air pump. tick, tick, tick there it was. Upon further investigation I discovers if I take of the hose that runs from the airpump to the exhaust manifolds on just one side the tick is gone. Connect it again both sides tick. Anybody have any ideas on this?