Don't mess with the spring, if it is below 180 it isn't opened anyhow so you won't notice a benefit... there is no way to fully close the system (and I'm not sure you'd want to have old oil just sitting in the cooler not rotating). If you are really overcooling switch out to a 25 row or do the blockoff plate. I am sure you will get track enthusiasts on the site that would be willing to trade up to the 34 in exchange.
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