yes, they should, up to 87.
When a pump is pumping water from a level that is below the pump it is called suction head. If the water to be pumped is at a level above the pump, it is positive head. The pump maybe pumping from...
it is the max vertical height upto which pump can supply the water.
a head with a pump! ;)
It's a bit simplified, but if you're really skinny you can get your body through a gap that you can get your head through - measured neck to forehead.