Edelbrock Air Gap intake. How are your heater hoses plumbed?

[Kern Dog]

Hello, I’m putting together a 1990
360 that came to me with the famous Edelbrock RPM Air Gap intake. I’m trying to figure out how to plumb it for e heater hoses. The prior owner had a hose nipple here:

That seems weird since then the hose would have to cross over the radiator hose. Other intakes often have a nipple here:

The problem with that is that the hole is smaller, like maybe 7/16”.
I put a plug in the threaded port on the drivers side of the thermostat housing along with a vacuum port behind the carburetor base. Is the smaller water port on the right side of the t-stat housing big enough to serve the heater? I don’t have a functioning heater in the car but would like to start making things work on the car.
Is it common to use the port in the first photo ?

 

[72bluNblu]

I use the one on the right side of the thermostat

 

[Kern Dog]

Thanks. I guess that I could go ahead and do the same. It just seems a bit awkward to have it there.

 

[mopowers]

I favor using the second option and just re-tapping the hole to 3/8" npt, if I recall the size correctly.

 

[str12-340]

all of mine are on the passenger side of the thermostat housing. This factory heater hose router attached to the front of the head holds both hoses and is very convenient (repop available):

 

[Kern Dog]

I probably have one of those brackets in a drawer somewhere.

 

[65 Cuda 340]

I have one heater hose going to the water pump, the other going to the boss on the passenger side, and the boss you're pointing to is for a mechanical temp gauge sending unit.

 

[65 Cuda 340]

Same deal on my 65 Barracuda 340. I just noticed you said the problem with the passenger side boss is that its hole is smaller. I don't remember having to make that hole bigger for either of my two small block intakes. I just used readily available fittings for the heater hose and the bypass hose from the intake to the water pump. ???

 

[Kendog 170]

I too used DS.

 

[JDMopar]

Many moons ago, I built a 64 Belvedere wagon, which had the heater core nipples coming thru the firewall on the drivers side. I wanted the heater hoses to go around the passenger side like normal, so I went to NAPA and bought heater hoses with pre molded 90 degree curves on one end and routed them the way I wanted them. Using a hose like that would allow you to hook it on the drivers side location and route it under the upper radiator hose. It would make a cleaner install and not kink the hose.

 

[1MeanA]

The manual says they come with 1/8,1/4 and 3/8 NPT holes so you would likely need a 1/4 npt to 1/2" hose barb. I'll have to look at mine and see what I was planning (final connections not finished yet).

7176, 7576, 75763 & 75764 q 1 - 1/8-27 NPT Pipe Plug q 1 - 1/4-18 NPT Pipe Plug q 1 - 3/8-18 NPT Pipe Plug

 

[Michael Siple]

LD340 has it correct while the RPM has them mixed up - easy to get correct fitting to keep heater hose where it belongs - my 2 pennies worth.

 

[memike]

I use the one on the right side of the thermostat

View attachment 1716407755

Same here

 

[TF360]

Who needs a Heater! Get rid of all that weight, and extra hose that gets in the way. Put a mechanical Temp. Gauge in there, and wear a Jacket.

 

[1MeanA]

Who needs a Heater! Get rid of all that weight, and extra hose that gets in the way. Put a mechanical Temp. Gauge in there, and wear a Jacket.

I do

 

[72bluNblu]

Who needs a Heater! Get rid of all that weight, and extra hose that gets in the way. Put a mechanical Temp. Gauge in there, and wear a Jacket.

Says a guy in Florida. I still drive my car in sub-freezing temperatures, I need a heater AND a jacket.

 

[TF360]

You guys are too soft. I don't think it's a daily driver.

 

[Kern Dog]

Even though the car is a beater, I hold out hope for myself that I will paint it and fix it up eventually. I'd like to get the heater working for that.

 

[72bluNblu]

You guys are too soft. I don't think it's a daily driver.

Well, mine is most of the year. When was the last time you even had to scrape ice off the windshield of your A-body to go for a drive Mr. Tough Guy?

Oh, right, probably never. This is you?

I use mine as a Ornament. There were several times when I used a Duster a daily driver. First one when I was 16. That was long ago, and the car (slant 6) was only ten years old. Now I view them as Art, and prefer a modern car with good gas milage that doesn't pollute for a Daily. It's a hobby for me.

Yeah, that's not soft at all.

 

[65 Cuda 340]

I don't scrape ice off my windshield, but sometimes I do need something to de-fog the windshield.

 

[TT5.9mag]

How I did the heater hoses on the magnum rpm air gap in my D100. Forgive the towel wrapped around the heater control valve. It drips and pisses me off.