This thread seems to show a 3/8 NPT temp sensor installed in the head near the thermostat. See: http://www.slantsix.org/forum/viewtopic ... fe5c6bdd25

Agree?

Has anyone else drilled/tapped in this location for a temp sensor? I'm contemplating it (for FitTech TBI) but want to check with experts. I could drill/tap the existing temp sensor spot to 3/8 NPT and put the factory sensor in the spot mentioned above, since it is only 1/8 NPT there would be more room. But, being lazy, I'd rather drill/tap only once.

Thanks all for feedback.

Brian

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Subscribed as I need 2 temperature ports as well - one for my FiTech (3/8 NPT) and the other for my Dakota Digital temperature sensor ((1/8 NPT). How about one or the other in the thermostat housing?

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65 Dart station wagon slant 6 - now under construction
47 Dodge Custom 4 Door sedan
87 D100 Short Bed slant 6

Retired USAF 1966-1986
Retired US Postal Service 2004-2014

I am under the impression that the FiTech sensor needs to be in the head to get an accurate reading. The factory sensor sends to an old school gauge so maybe not as important, the thermostat housing would be an ok place for that one. But, I think there is plenty of room in the head for these, as later heads had multiple ports in that area.

Brian

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https://tinyurl.com/yynpj4v2

The later lean burn equipped engines have a second temp sensor in that location.

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1976 Feather Duster /6 4sp
1984 W100 318 727 np241
1972 'Cuda 340 4sp
1985 D250 360 46RH

Thankyou, do you know if it is a 3/8 npt by chance? I'll measure carefully anyhow, but curious to know if it's been done with that size.

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The 1975+ heads had the temp sensor in the standard location and a threaded hole that got a vacuum switch that was similar to the size of the hole needed for the early 60's head temp sensor... The late heads had holes for all of the above and the second temp sensor...

The last of the drool tube heads should also have the position for the vacc switch since they were EGR equipped...

FYI.

DI is correct. Mine has a vacuum switch in that location. However it has a raised boss that the one in the pic doesn't have and it is 3/8 npt. The lean burn temp sensor is where the gauge temp sensor is in that pic and it is 3/8 npt. My gauge temp sensor is to the left (towards the rear of the engine) of the vacuum switch in that pic.

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1976 Feather Duster /6 4sp
1984 W100 318 727 np241
1972 'Cuda 340 4sp
1985 D250 360 46RH

Mine doesn't have the boss, it is a drool tube head, older one. It seems like that picture shows way more area there than on mine, e.g. to the right of the sensor it looks like (to me) 3/4" or so of material, whereas on mine a 3/8 NPT sensor would take up more space there.


I'll take careful measurements before drilling/tapping.

Brian

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https://tinyurl.com/yynpj4v2

You could use the new temp sensor in your currently location... the obtain a late model temp sensor (for a 1977 Volare).... the late temp sensors are only about 3/8" wide so you could drill and tap for that without taking a lot of real estate.... (never had a problem with a late one reading off when I had a late engine under the hood of the '67 beater valiant and no change to the stock gauges)....

Just something to think about....

Remove heater hose fitting, replace with nipple and three way tee fitting,heater hose to one port,short nipple and connector into last port.Sensor into the connector. With full time flow back to water pump this should be accurate enough. This is low risk to head.

You could always drill the original, smaller (1/8 NPT) sensor hole out to 3/8 NPT for the gauge adapter. I have done this a few times on a slant head. then, you can drill and tap a much smaller hole in another spot for the small OE sensor.
-Matt

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-MattMan
LEANED & MEAN

Yes, Matt, that was my original thought, I was just being lazy and only wanted to drill/tap once. Might end up there just to be safe, but I'll check out how much material real estate there is once I have the thermostat housing off. Might be OK to put the 3/8 NPT up by the housing where that pic shows it.

Brian

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https://tinyurl.com/yynpj4v2

This housing appears to have a boss for a sensor, does this fit the slant six thermostat?

https://www.summitracing.com/parts/rnb- ... model/dart

Also, this nifty guy might be a time saver if they make one that fits slant six:

http://www.jegs.com/i/Meziere/680/WN0028S/10002/-1


Brian

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If I recall correctly, the Jegg's piece would fit a slant. I think the thermostat gaskets are the same between the big block and the slant. The only problem with that piece might be interference between the temp sensor and the thermostat.
The Dorman piece will possibly have the same issue as well as needing to locate a top radiator hose to fit it.
Keep it simple-works for me.
-Matt

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-MattMan
LEANED & MEAN

My temp sensor for the factory gauge in the cluster, for me, is really about watching for any overheating, pretty much an idiot gauge. I have a 3/8 NPT plug in my top radiator tank, I could put the factory temp gauge in there, and drill/tap the factory boss to 3/8 NPT for the FiTech sensor, since it requires more accurate readings.

Any thoughts on that?

Brian

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https://tinyurl.com/yynpj4v2