It's extra incase you want to run a bypass thermostat or extra heater core. You can safely plug it.
Oh, they are inlets, btw. The water pump sucks water in through the hose and pushes it through the block.
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1950 Chevy pickup with '62 261, 4 speed.
[This message has been edited by 4onthefloor (edited 07-31-2003).]
