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NAPA Hi Flow 170 Degree Thermostat

Posted By oldcarmark Last Month
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oldcarmark
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Quite awhile ago there was a topic regarding Hi Flow Thermostats. One that was mentioned was a Hi Flow 170 Degree Stat from Napa. I got One and it works great. I don't remember the Napa #. Does anyone know the # I am looking for? Something like THM 7 maybe? Thanks I found it. THM 6

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Florida_Phil
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Don't know the NAPA number.  I bought mine locally from NPD.  It's their part number T-8575-3 $19.60.  It's probably available cheaper elsewhere.
oldcarmark
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I found the Napa # THM6. I have One in mine and it works well. Never could get the Robertshaw Ones to work for some reason. Tried 3 and gave up and bought the Napa One. Friend wants One.

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paul2748
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Yep - THM-6


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
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DryLakesRacer
Posted 3 Weeks Ago
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Ordered from NPD yesterday along with gaskets. Guess I'll finally have the right one this time.

56 Vic, B'Ville 200 MPH Club Member, So Cal.
DryLakesRacer
Posted 2 Weeks Ago
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Hey all, I installed the 170* from NPT today any all went very well. Along with the old high-flow 160* Mopar unit it always stuck closed after first startup; it always did open but not until approx 190* and then shot down to what I determined to be 160*. Bugged me but I let it go these last few years. The new one worked in a sauce pan on the stove at 170* and when doing the first test in the car showed water movement with a cardboard in front of the radiator and 169* at the neck of the bypass hose into the top of the water pump. I do have a 1/8" hole in a plug. The new reading on the factory gauge is now about 2 needles with higher than before and where our 56 always ran as I remember in the early 60's.

There is a note in the thermostat box that says you need 1-1/2" between the front of the manifold to heater line and with the dual quad Edelbrock manifold and the deluxe heater vacuum actuated valve there was only 1/2". To make it clear the thermostat only needed to be clocked vertical on it's interior structure as not to interfere with the valve; so all was good.

Next project is to get the speedometer reading correctly after the install of the new Explorer 8.8 with 2.73 gears. The smallest nylon gear i can find is a 19 tooth and 17 is whats needed or maybe even less. I'm working with Rusty @ Speedmeter Service in Colorado (HAMB) and Steve at Texas Electrical Instruments with an adapter to keep it all mechanical and it all looks good and will keep the cost a lot lower that a GPS conversion or GPS to mechanical with these older transmissions..I hate jacking up the car a foot and crawling under but what's a guy to do....









56 Vic, B'Ville 200 MPH Club Member, So Cal.
oldcarmark
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DryLakesRacer (5/1/2019)
Ordered from NPD yesterday along with gaskets. Guess I'll finally have the right one this time.

I tried 3 of the Robertshaw Type and never could get them to work properly. I have used the Napa Hi Flow all last Summer and found it worked really well. Consistent
Temperature with very little Temperature movement up or down.

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DryLakesRacer
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I know there are different ones and designs but  i really don't remember one from another. I know the "bellows" type would never have fit with the room I had in the manifold. The one I took out was for a Mopar and hi-flow which I was sure I needed back when I was have heating up problems. It may have been marketed thru Mr. Gasket. It had approximately a 1/2"  "cup" with 3 oval holes in the bottom and a large opening into the hose housing. The one I received from NPS was in a Casco box and it is the open spring type  with a large opening like the first hi-flow and is listed in the NPS catalog as a hi-flow.. 

56 Vic, B'Ville 200 MPH Club Member, So Cal.
oldcarmark
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DryLakesRacer (5/9/2019)
I know there are different ones and designs but  i really don't remember one from another. I know the "bellows" type would never have fit with the room I had in the manifold. The one I took out was for a Mopar and hi-flow which I was sure I needed back when I was have heating up problems. It may have been marketed thru Mr. Gasket. It had approximately a 1/2"  "cup" with 3 oval holes in the bottom and a large opening into the hose housing. The one I received from NPS was in a Casco box and it is the open spring type  with a large opening like the first hi-flow and is listed in the NPS catalog as a hi-flow.. 

Sounds like the One sold by Napa. Bigger opening than Standard Stats.

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paul2748
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As far as the speedo gear, what trans are you using?  If you are using a 57 or later with the redesigned gear, look for a gear on ebay.  If it's an earlier trans, your options are a lot more limited.


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
http://www.y-blocksforever.com/forums/Uploads/Images/5e8a83b9-17a0-4583-8f25-c861.jpg
Midland Park, NJ


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