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I am also trying to figure out which thermostat is best as I also have a 63 mm expansion tank. One thing to keep in mind is that the thermostat goes into a not so large hole in the intake (at least on my intake). As the diameter of the thermostat flow hole increases (to flow more coolant) the clearance arround the outside decreases. Thus if a really large one is used you will cut off coolant flow to the thermostat from the back side (arround the sides feeding from the manifold).
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