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Installing heater hoses and find out there is supposed to be a restrictor. I have a 23/64 , that is less than 3/8 in the manifold now, but the 5/16 in my hand is the original. Do I have to put the 5/16 in it? I have been running the larger one for 2 years now. This is a 1979 F-350 4x4 with a 460.
The 5/16 one is actually the smaller one.
You say use the larger one? The reason I am asking is because, they say, the smaller one will help against surging on full throttle and not to blow a hole in the heater core.
I see no reason to restrict flow into the engine, that would seem to raise the pressure on the heater core. If a restriction was needed it should be on the water pump fitting IMO.
I see no reason to restrict flow into the engine, that would seem to raise the pressure on the heater core. If a restriction was needed it should be on the water pump fitting IMO.
What was used from the factory? And under what conditions?
What engine would have used them in what vehicles?
Since the factory didn’t install 460s in the four-wheel-drive trucks that year, presumably the engine is using one from the original donor vehicle? Unless it was changed?
Did the 2 Wheel drive pickups use a restrictor? I don’t remember seeing one in any four-wheel-drive. But then again, I usually wasn’t looking!
Was it for different heater cores maybe? The two and four-wheel-drive trucks use the same heater core in general, correct? That would be except for the super duty arctic heater option maybe. I’ve only ever seen them on super camper specials, but I presume they were available on other vehicles as well.
Sorry for all the side questions. I’ve just never seen a restrictor in one of our trucks before.
What was used from the factory? And under what conditions?
What engine would have used them in what vehicles?
Since the factory didn’t install 460s in the four-wheel-drive trucks that year, presumably the engine is using one from the original donor vehicle? Unless it was changed?
Did the 2 Wheel drive pickups use a restrictor? I don’t remember seeing one in any four-wheel-drive. But then again, I usually wasn’t looking!
Was it for different heater cores maybe? The two and four-wheel-drive trucks use the same heater core in general, correct? That would be except for the super duty arctic heater option maybe. I’ve only ever seen them on super camper specials, but I presume they were available on other vehicles as well.
Sorry for all the side questions. I’ve just never seen a restrictor in one of our trucks before.
This 460 came out of a 1976 RV motor home. The heater core in my truck is the larger one that was offered. That said, all the other comments that said they popped their heater core, I'm not sure what one they had.
Most of the trucks in those years used the Heater control valve as the restrictor. A friend keep blowing his heater cores up till we figured out the valve was in the wrong hose.
My last heater core came with a restrictor in the box, it was for the pressure hose from intake, the return hose goes to pump. All the HPP Mustangs and Crown Vics came with them from the factory. If you're not turning a lot of rpms you will probably be fine.
Most of the trucks in those years used the Heater control valve as the restrictor. A friend keep blowing his heater cores up till we figured out the valve was in the wrong hose.
Mine does not have a heater control valve, but Im now thinking it needs one. The heater keeps putting out heat, even in the summer, vents and fan off, still heat. I thought it was the flaps needing rebuilt in the heater box, but this would make sense to have a valve. Looks like I need that restrictor after all. Thanks
My last heater core came with a restrictor in the box, it was for the pressure hose from intake, the return hose goes to pump. All the HPP Mustangs and Crown Vics came with them from the factory. If you're not turning a lot of rpms you will probably be fine.
I don't turn high RPMs, but It may be wise to just put one in anyway. Thanks!
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