Factory Tstat and Control Point Question - 5.3L L83

[scr71822]

Stock is 194. A 180 is plenty. These engines make power at 175-180. You?re already on the hot end of that. If the stat is working correctly it should close at 180 and hold you there despite how low the ambient

Stock is 207

[scr71822]

Then it?s not truly a 180. Look at the Katechs. They just brought production In house to improve quality control

It is definitely not OEM quality. On the stove it did look to start opening at 178 by my meat thermometer which is probably not the most accurate. Its probably opening closer to 172 by the way the temp readings were.

If I lived in the south it would probably be fine, but I live near Chicago, this winter we had several days below zero, this forced me to replace my previous 180 and found the gasket was tore causing it to remain open a little.

[WS6FirebirdTA00]

Thanks for sharing.

The main issue to worry about with any element like that is the cracking temperature and the fully open temperature. Sounds like how it is marketed is fully open at 180, but with a lower cracking temperature.

[scr71822]

sounds like a faulty thermostat. a 180 begins to crack open at 180 and is fully open around 194. if it is running below that then it's stuck open. that's what happens when we buy things from mishimoto.

You are right I got another from them as a replacement after spending $60 bucks on it. It is poorly designed and is open partially all the time it appears even when it is sitting on the bench.

[nicul15]

Stock is 207

You?re right. Pulled the stat.
In the truck stock tune says 194 but the stats stamped 207.

2016 camaro ss - time says 194, stats stamped (90c)194

[lucas287]

2016 camaro ss - time says 194, stats stamped (90c)194

Reviving this thread. There's a lot of different answers out there to this question, but I'm curious if anyone definitely knows what the stock thermostat is stamped with in a 2016 L86? I'm thinking since it's nearly identical to the engine above, that, it too, is a true 194* stat. Reason being is how cool my truck runs.

On the way to the office in the morning (taken while cruising at 70):

*Ambient temp = 75*

*Intake temp = 77*

*Oil Temp = 185*

*Coolant Temp = 179.8*


On the way home last night I had lots of traffic then 15 minutes at 70 MPH on IH10. And no I didn't take these readings after coasting to a stop

-91* ambient

-93* intake temp

-210* oil temp

-190* coolant


The hottest I've ever seen it with max A/C and 100* temps in traffic is 205*.