wat does the water pump do....

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Apr 27, 2007 | 08:41 PM

#31

Damon

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Joined: Dec 1969

Posts: 1,147

From: Phila., PA

Quote:

Not normally, unless its a truck with the heater return back to the radiator tank itself. Normally the heater hose plumbs back into the coolant crossover jacket which then routes the coolant through the thermostat and out the waterneck.

SBC's have a coolant bypass on the passenger side water pump leg that recirculates the coolant back into the block until the thermostat opens.

Not sure what small blocks you've been working on, but on every (Gen1) small block I've worked on the hot water comes FROM the coolant crossover in the intake, through the heater core lines and returns TO the rad or the water pump (doesn't matter which- either one is on the suction side of the pump), creating a complete recirculation path for the coolant when the stat is closed.

The second part I'll agree with, but that passage is TINY. Maybe 1/4" at the most. It won't flow anything like the heater lines will.