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Discussion Starter · #1 ·
How can I tell what degree thermostat I have in my truck? I have never changed it so I know that it is whatever the factor put in it. Looking at the gauge it is kinda hard to tell.

I want to change it out for a 160 but I would also hate to do that if it is already a 160.
 

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The temp should be stamped on the outer ring somewhere.
 

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On the 1995 5.9/5.2 Magnum V8s the factory thermostat was a 'standard grade' Robertshaw/Siebe with 195 stamped on it.

I don't think that a 160 degree thermostat will work well. Dyno testings has shown no advantage in either HP or Torque for 180 or 160 thermostats. Anything below a 180 will usually trigger a check engine light.
 

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Discussion Starter · #6 ·
Thanks everyone, and sorry the 180 was my fingers and brain not working. I was thinking about the 180 not 160 like I had typed.

I picked up a Hypertech programmer and wanted to change the thermostat before I made any programming changes to the truck.
 

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195 stock. 180 if your run any type of programer or PCM. Also get the step colder plugs.
 
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