Heater Hose Size

1970 and newer started the mixed sizes 1/2 and 5/8 of heater hoses. 1969 and back was 5/8” on both.

The fittings on the water pump/intake were matched to the heater core sizes. So when swapping parts this becomes a problem.

look up the reproduction heater hose fittings and see the changes.

Heating & Cooling, Heater Hose Nipples :Mega Parts USA