thermostat for the 400 engine
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New User
Joined: Aug 2008
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From: Squaw valley/Lake Tahoe
thermostat for the 400 engine
i have seen on this form and been told to only use a Cooper-Robertshaw thermostat. why is this brand the only one to use? is thier a problem with the NAPA autoparts thermostat? if so what is the difference?
Senior User
Joined: Jul 2008
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From: Mariposa, CA
I've never heard of that brand, I have never had a problem with Napa products. Napa thermostats are made by Stant, the one they call super stat is better in quality. although in my toy0t@ i had to use a factory unit, all other failed after a couple of weeks. Good Luck -RW
Posting Guru
Joined: Aug 2005
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From: Coal Country, ND
The ROBERTSHAW is the correct thermostat, I'm living proof...well maybe my truck is. I had an overheating problem, went to the "correct" t-stat and my overheating went away. Do a search on it, try the part # which I think is 333-192.
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
I think it has something to do with the shape of the sides doesn't it? I thought I saw a diagram regarding that once. I don't have my 400 build book with me otherwise I'd try to look it up. Although I have a Gates thermostat in my 400 and it has worked fine.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
351C/351M/400 Thermostat
As original: D0AZ8575A .. Thermostat-192 Degrees (Motorcraft RT139)
Still available from Ford: MSRP: $8.62.
Fits: 1970/82 351C/351M/400
This is the only T/stat listed for these engines.
A search thru several car & truck parts catalogs shows D0AZ8575A was not used with any other engines other than the original applications.
Still available from Ford: MSRP: $8.62.
Fits: 1970/82 351C/351M/400
This is the only T/stat listed for these engines.
A search thru several car & truck parts catalogs shows D0AZ8575A was not used with any other engines other than the original applications.
Laughing Gas
Joined: Dec 2000
Posts: 781
Likes: 18
From: East Texas
Unrulee was correct on the part no. for the Robertshaw t-stat. Here's a link to it at Flowkooler:
FlowKooler Water Pumps
FlowKooler Water Pumps
Posting Guru
Joined: Aug 2005
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From: Coal Country, ND
Here's a comparision pic
The "correct" one is on right. Supposedly there is a bypass in the block that only works with the one on the right.
The "correct" one is on right. Supposedly there is a bypass in the block that only works with the one on the right.
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1970, 333192, 351m400, 400, automotive, cooperrobertshaw, correct, d0az8575a, engine, ford, motorcraft, napa, recommended, reviews, rt139, thermostat
