To make a long story even longer, I need a coolant temp sensor that will kick the fan on at about 175-180. I would rather not use one that attaches to the radiator. I need one to fit into the Vortec manifold. does GM make a sensor that goes that low? (230 is ridiculous). Does anyone have a part number?

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Carburated 5-speed
Vortec heads,1.6 roller rockers, .480 Crane cam,T-5,355 4-bolt, 3.73 posi,SSM Kit