740gl water pump

Same as any other.

Here's some pumps from one our shop's suppliers, showing 4 brands that fit my '90. Different designs for the impellers (some have exposed vanes, some covered by a "disk" on the block side, but still the standard design... suck it in through the big hose, blow it out the smaller ports.

Looks like I will have to pull it off, Can not see the vanes through the hose port like I expected to.

What water pump can you see the vanes through the hose port? The big hose is the intake port to the pump, water is plumbed through a passageway to the center of the impeller and then ejected through the back into the engine block and through the top into the cylinder head.

There's not much to go wrong with the vanes though, the only problem I've ever had was when a salvage yard radiator had a pebble in it that made it into the pump. Usually the bearings and/or shaft seal fail.