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i've been drilling thermostats for decades with nothing but improvement in the system. the only potential downside i have ever found is that the heater will take longer to generate heat in the cabin. it makes bleeding a snap, evens out the temp swings, and helps prevent superheating due to flow restriction.
it won't cure an undersized or blocked system.
the holes sizes and quantities vary from thermostat to thermostat, based on the flow needs and the thermostat size. on the 968, i drilled 6 .06" holes.
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