Re: What thermostat?
+1 more for the stock thermostat temp.
Did you burp the system? How did you fill the coolant?
Easiest way is to fill the engine from the top radiator hose, helps get most of the air out.
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1999 GMC Suburban K2500 SLT, 454/4L80E
1991 Z/28, 6.0L/T56
1949 GMC 250, S10 Frame, 6.0L/4L80E
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