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Re: Do thermostats have a break in period?
You said crate engine, is it a vortec or does it have vortec heads? Do you have the heater core connected? If not do you have a bypass hose from the intake to the water pump?
My gauge on my vortec would fluctuate wildly even with a hole in my thermostat before I ran a bypass hose. Now with a bypass hose it's steady as a rock.
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