I will tell you what I did.
When I was building up my new engine I took my old thermostat, bought a duralast from autozone and got a carquest thermo.
I put all 3 of them in a pot of water and boiled them together.
My old thermostat only opened a little more than half way, so it was junk.
The duralast opened first and closed last compared to the carquest.
So the carquest became my winter stat and the autozone is my summer thermostat.
Only problem with that is I never put the winter thermostat in.
All 3 were 195'F thermostats.
I would run a 205'F if I could find one.
What I really need to do is build a set of grill shutters. Open them manually automaticly with a 190'F degree shutterstat and have a manual backup.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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