I have the Weiand Aluminum pump installed, with the port blocked. You Want to have the circulation bypass port Blocked! This will make 100% of the water flow through the radiator. The reason for the bypass is so the engine will warm-up faster on cold winter mornings(and in so doing help with smog emmisions). When blocked, it will just take a couple of minutes more to do so. I have installed a 180 degree thermostat. At the time I did not drill one or two 1/8" holes through the rim, but the next time I have it out, I intend to, so that there will be NO trapped air/steam under it before it opens. And NO the holes are NOT intended to aid circulation; or to cause the thermostat to open any quicker. Marlin.
[This message has been edited by MARLIN JACK (edited 05-20-2004).]
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