[Jac Mac]

Originally Posted by Rick Parker

1 barb is designed to have a curved hose attached to it and to the nipple on the thermostat housing, to provide a coolant bypass, while allowing an even warmup of the engine. The other barb is drilled, tapped and plugged with a 1/4" tapered pipe plug if no heater is being used. If a heater IS used, one of the heater hoses attach to it, with the other hose going to a 90 degree barb coming from the intake manifold. Water exits both barbs.

Wrong flow direction Rick, Water enters both barbs. Water to heater exits intake manifold to heater & returns by lower barb on pump. Upper barb on pump connects to thermostat by-pass on t/stat housing- flow being from T/stat to pump.