Join Date: Mar 2001
Location: Peoples Republic of Vermont
If you're talking about a SBF (221-260-289-302-351) then the rear water passages shouldn't be used. Coolant flows from the water pump into the block on each bank, down around the cylinder bores then up into the heads and exits from each head at the front into the intake manifold where there are two exits, a large one into the thermostat housing then to the radiator, and a small one to the heater core and, after going through the heater core, back to the water pump. Any rear water passage in the manifold should remain plugged.
What, me worry?
- Alfred E. Neuman