Allright you guys. Need alittle help with this in order to end the debate. Ive got a non-AC '71 GMC w/350 motor, pretty close to stock. Ive got a heater hose fitting in the side of the waterpump and one on the radiator close to the cap. Which of the heater core hoses goes to which fitting? Top to ? Bottom to ? Also, one hose fitting is smaller than the other. Is this the input or the output? Appreciate the help.