Quote:
Originally Posted by Slowmotoring
Im thinking it should be as close as possible to the head so the thermostat reads a more accurate temperature rather than the heat having to travel up the hose for it to open. Which is another good reason to have some water flow even with the t-stat closed to help get the hot water to the t-stat. Just my thoughts though.
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That's what the extra holes do. They allow water from the engine to circulate past the T'stat so it gets warm water quickly. I have 3 x 1/8" holes in mine and have run that way for years. If there are no holes, it takes too long for the T'stat to get warm enough to open and when it does, there is a surge of water that can overwhelm to radiator.