Ok this is odd. O'Reilly's is showing me weird hoses that are 5/8 at one end and 3/4 at the other plus normal 5/8 hose. They want stupid prices for the hoses, $24-42 per hose:
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Molded Heater Hose Pipe To Thermostat; Cut To Length
End 1 Inside Diameter (in): 5/8 Inch
End 2 Inside Diameter (in): 3/4 Inch
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Molded Heater Hose Heater To Pipe; Cut To Length
End 1 Inside Diameter (in): 5/8 Inch
End 2 Inside Diameter (in): 3/4 Inch
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Molded Heater Hose Heater To Engine; Without Auxiliary Heater; Cut To Length; 90 Degree
End 1 Inside Diameter (in): 5/8 Inch
End 2 Inside Diameter (in): 5/8 Inch
Edit: ok now i see why ... Ford put 3/4 barbs on this '89 heater core instead of 5/8 like the '85 RV had, at least according to replacement heater cores. I'll probably just get a couple of 5/8 to 3/8 reducers and 1ft of 3/4 to adapt normal 5/8 hose.
But i don't understand why it calls for 3:
1: Pipe To Thermostat (5/8 - 3/4)
2: Heater To Pipe (5/8 - 3/4)
3: Heater To Engine (5/8 - 5/8)
part of it is 3/4 heater core is for "w/ AC" so maybe #3 is just unused for me? Not sure what "pipe" it's referring to and why one is marked thermostat.
Since I plan to delete rear, I should just need:
1: 5/8 from water pump top barb to 3/4 heater core (via reducer)
2: 5/8 from passenger side engine barb to 3/4 heater core (via reducer)
Or am I missing something?