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The only reason to restrict flow is to make the engine run hotter, or to prevent pump pressure from blowing the cap open on a top tank radiator. You can not make the engine run cooler by restricting flow. That is an old wives tale that has been disproven by scientific testing. Higher flow = lower, more consistant temps in the heads, reduces steam pockets and reduces detonation. Proceed acordingly.

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Is that really a fact?
I believe that if water flows slow through the rad it will be cooler entering the motor.

Btw i have always used a stat with a mech pump.
I even used a stat on my hemi with elec pump seemed to work but got too little run time to say for sure

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If you have an electric water pump, don't run a thermostat or a restrictor.

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please explain why not.
Doesnt an electric pump move more water than a mech at idle?
Im about to use both a stat and the heater.

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You can leave the pump running and completely cool the motor down. If the thermostat closes, you can't circulate water.
Meziere says NOT to run a thermostat w/ any of their pumps.

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They may say not to, but that doesn't mean it can't be done. Street driven with a Meziere for 6 years with a 160º stat with five 1/8" holes around the perimeter, never a problem. The holes make all the difference.

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If you have an electric water pump, don't run a thermostat or a restrictor.

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This how I run my car..street and strip for 6-7 year..no problems