Water pump on Olds 455

[84/ttop]

I went to get a new waterpump on my 455 the other day and the guy at the autoparts store told me that the only one he could get had 2 ports on the top. The one that I have on there only has one and I've noticed that other 455s have the other pump. I know I can get the regular pump on summit racing but I was wondering if I should use the other one. Where does the other port go?

 

[Peter]

4 ports on olds waterpumps, 1 for upper radiator, 1 for lower radiator, 1 for water neck, and one for the heater core

 

[CutlassJ]

Im not sure myself where the other port goes. I have that same pump on my car with the two ports now and just have it blocked off with a cap. My biggest problem was getting the pulleys to line up. My pulleys are underdrive so they only have two grooves in them. That was a head ache the shaft ends up being shorter needed the shorter shft water pump to make it all work.

 

[FE3X CLONE]

As mentioned, one port goes to the water neck bypass and the other port goes to the heater core. If your not running a heater then that one can be blocked off with a small pipe plug.
A lot of guys that don't run thermostats or restrictor plates in place of a thermostat also block off the bypass as well.