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Old 05-31-2009, 09:38 PM
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small block chev. heater hose routing

I have a 383 in a rambler wagon. Currently the heater hose goes from the driver side front on the intake. As it is, the hose runs to the back of the motor ,across the intake ,and to the heater core.There is another outlet on the front pass. side but the a/c compressor covers it. The other heater hose comes from the water/pump side to the heater core. On the top of the w/p there is a 3/4 pipe plug. Can I use this instead of the one on the manifold.Currently this hose is in the way of everything. Is there a certain flow pattern or does it even matter?

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Old 06-01-2009, 02:54 PM
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heres the sizes:

5/8"

3/4"

the 5/8" goes to the intake manifold front

the 3/4" had two options depending on the radiator and heating options

either to the water pump top,. or to the radiator tank pass side upper

to the rad tank was usually HD cooling option

to the water pump was std and typical and most common

the intake manifold one is for the 5/8 and is always used regardless of options

you need to use the 3/4" in either the WP or the rad tank


some water pumps have a plug in the top and some dont

because some were connected to the rad tank instead

this is how the GM v-8 engines are anyways., other makes and models differ slightly or completely.

good luck!

Last edited by fast68; 06-01-2009 at 11:31 PM.
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Old 06-01-2009, 10:28 PM
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small block chevy.heater hose routing

Thanks Fast68. I guess my only alternative is to raise up the a/c comp and come up with a really small 5/8 90 degree fitting. The way things are now the hose and its cable to open the heat control valve(which is in that line)run right in front of the dist. And in front of the hose is the coil and the engine vac. lines for the trans.,power brakes, vac.wiper motor. It really gets busy in that small area.Also I have Griffin aluminum radiator with no extra outlets.Do you think that maybe I could use a 5/8 tapered pipe tap and open up the hole so it will go in farther ? Giving me a lower profile.Or do you know of a tight 90 degree fitting?

Last edited by stanjr41; 06-01-2009 at 10:34 PM. Reason: left out data
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Old 06-01-2009, 11:11 PM
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There is no such thing as a 5/8'' tapered pipe tap. [or 5/8'' pipe] What you likely have here is a 1/2'' threaded hole with a hose nipple that will take a 5/8''hose. The shortest 90* trun that can be made with standard fittings is by useing a ''Street Ell'' Its a regular 90* fitting but it ha male threads in one side and female threads on the other.
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