Are there any high quality thermostats?

Paul_G · Apr 13, 2022

Doing a coolant flush on the Hemi. Pulled out a 160 stat. My guess is it is 15 years old. It has USA stamped on it. I am thinking about putting it right back in.

I always used Stant Stats with no issues. I have read that they are now Motorad, and junk.

diesel_lv · Apr 13, 2022

I've used the Mr Gasket ones that are made of brass like the Robert Shaw ones and no problems. There's also Flow Kooler that has brass ones like the Robert Shaw ones. Can't guarantee where they're made.

Demonic · Apr 14, 2022

I put in an EMP/Stewart from Summit and the larger opening helped a bunch. Looks like stock/ NOS thermostats from pre-'67.

https://www.summitracing.com/parts/emp-301

Don67Satellite · Apr 14, 2022

Funny to see this question posed tonight as I was also searching the forums for thermostat ideas. I ended up purchasing a RobertShaw 370-180. There are some on eBay.

snakeoil24 · Apr 14, 2022

Milodon

Paul_G · Apr 14, 2022

I decided on the EMP Stewart 180°.
https://www.summitracing.com/parts/emp-305

69a100 · Apr 14, 2022

Paul_G said:
Doing a coolant flush on the Hemi. Pulled out a 160 stat. My guess is it is 15 years old. It has USA stamped on it. I am thinking about putting it right back in.
I always used Stant Stats with no issues. I have read that they are now Motorad, and junk.

If it works good, use it is my motto! Don't know about the Motorad thing, but Stants are good!

beanhead · Apr 14, 2022

Milodon and EMP are the same unit, made in USA by RobertShaw. Best you can buy.

Milodon

EMP Stewart

1 Wild R/T · Apr 14, 2022

beanhead said:
Milodon and EMP are the same unit, made in USA by RobertShaw. Best you can buy.

Milodon
View attachment 1269687

EMP Stewart
View attachment 1269688

View attachment 1269685

View attachment 1269690

They look like a good piece but when I was in the trade I saw more of them fail than any other design of thermostat....

gtx6970 · Apr 15, 2022

I have a stewart in mine.

And have ZERO complaints.
Its not cheap though.
But imo....worth every dime

toolmanmike · Apr 15, 2022

1 Wild R/T said:
They look like a good piece but when I was in the trade I saw more of them fail than any other design of thermostat....

I test mine on the stove with a pan of water and a thermometer.

Geoff 2 · Apr 16, 2022

The stat shown in post #6.......is sold by Milodon, Shaw, Mr. Gasket & probably others....& made in the same Chinese factory.
[1] The three leg top piece is s/steel. The earlier ones that were made in the US had this section made out of brass.
[2] The drilled hole in the side are only needed if the w/pump bypass is blocked off. The original idea for these drilled stats comes from Stewart water pumps because their race pumps eliminated the bypass & the these holes were needed to bypass pressure build up, should the stat jam shut.
Unless you have blocked the bypass in your engine, drilling the holes is a backwards move because the engine takes longer to warm up & your engine will wear quicker.
[3] The Chinese stats often jam first time used because the internal rubber seal is tight. Dribble some auto trans fluid into the stat for lubrication & then test that it opens in hot water. I have found that after doing this they work reliably.
[4] Temp regulation is not great. They seem to open correctly, but a 160 once opened may not fully close until it gets down to 140ish.

Are there any high quality thermostats?

Paul_G

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diesel_lv

Well-Known Member

Demonic

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Don67Satellite

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snakeoil24

FBBO Gold Member

Paul_G

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69a100

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beanhead

May I Land My Kinky Machine

1 Wild R/T

FBBO Gold Member

gtx6970

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toolmanmike

Henchman #2

Geoff 2

Well-Known Member

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