Thermostat recommendation.

Dana67Dart said

IMHO.
1ST replace the thermostat what is called for by the manufacturer.

2nd as others have said if the engine runs hotter than the the thermostat you have a cooling issue. (Clogged radiator core, bad water pump, blocked water passages, pulley diameters not correct, fan not correct for the application, radiator not correct for the application, )

What engine, radiator, modifications, etc

Click to expand...

The engine is a Magnum 360 (5.9L). I just installed a new aluminium BeCool radiator. Is it possible that there was an air pocket in the radiator when I filled it after installing new? Before the new radiator the notest it got was 190', now it climbs to 210-212'.... the problem i'm having finding another thermostat is the flange dia. I need a 2.250" dia. and all i'm finding is 2.500" or smaller.