Re: Running cooler - does this make sense?
The "slowing the flow" was a popular Hot Rod idea in earlier days. The head gasket should control the water flow. A washer isn't going to do much either way, look at how much a thermostat blocks. Flow blockage over a very short distance, like the venture in a carb, or dent in a header pipe, really has little effect on flow.
Modifying the water pump is an attempt to stop cavitation at high speeds. Also a common early Hot Rod deal.
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