Really hate asking this question
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New User
Joined: Jan 2016
Posts: 22
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From: Lindenhurst NY
Really hate asking this question
I have a 1977 f-250 with a 400m. Where can i order a thermostat from these days. I have read a bunch of threads about them and feel more confused then when I started. I keep reading all the good ones are discontinued but all the threads stop a few years ago. So...... where do I order from and what do I ask for?
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New User
Joined: Jan 2016
Posts: 22
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From: Lindenhurst NY
So I should be good with this one?
Stant SuperStat Thermostats 45359 - Free Shipping on Orders Over $99 at Summit Racing
Stant SuperStat Thermostats 45359 - Free Shipping on Orders Over $99 at Summit Racing
Lead Driver
Joined: Mar 2010
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From: West Virginia
Elder User
Joined: Feb 2016
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From: Moro, Oregon
if all else fails call a local napa or some such parts store and compare part numbers.
you'd be surprised how many different vehicles one thermostat part number fits, for instance the one for my 390 cross checks to something like 20+ ford vehicles 15 chevys and a bunch of dodges...
but i digress phone calls are cheap insurance call summit or any number of parts places and get the info you need. they have phone numbers for a reason
you'd be surprised how many different vehicles one thermostat part number fits, for instance the one for my 390 cross checks to something like 20+ ford vehicles 15 chevys and a bunch of dodges...
but i digress phone calls are cheap insurance call summit or any number of parts places and get the info you need. they have phone numbers for a reason
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Laughing Gas
Joined: Mar 2014
Posts: 917
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theres your problem, there is NO 400m, it's just a 400.
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I have the strangest ford 400 problem on the planet. On an 85 degree day, the engine will only heat up to 155 degrees if I leave the radiator uncovered and use a 195 degree thermostat. So I can’t use a 160F thermostat, however I did use a 160F in my 1997 f150 for 150k miles. When the mechanic rebuilt the engine he said that it was the cleanest he had ever seen.
Senior User
Joined: Feb 2016
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Apparently the guidance from my speed shop was not bullet proof. Mr gasket 4365, Mr gasket 4365 & Mr gasket 4365 does not not have the 11/16 flange at the bottom. It shuts the bypass closer to operating temp. I will be changing to a NAPA thermostat With the correct flange.
Fleet Mechanic
Joined: Nov 2009
Posts: 1,398
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Interesting. Is it because the engine is running too cold?