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Heck, in my findings they are not needed at all. Mostly they are used for cosmetics.
I only have one version of an engine smaller than a 2270 that uses one.
Last week I built 2 identical engines, one was for a 914, the other was for a Bug with the 911 shroud. With the EXACT same settings the STOCK cooled engine COOLED BETTER!
Test was done on the same day, same weather, hell I even used the same distributor and same carbs. I have witnesses, one of which now does not want the 911 shroud on his engine!!!
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Jake Raby
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