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Old 06-08-2007, 06:59 PM
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Yes, rusting closed or open is the main drawback to those valves. That is why Detroit has gone to the intake air heaters instead. And your concerns about them being too restrictive or 'blowing out' are unfounded. There is plenty of flow area in the X-over for normal street driving - you can't tell a difference. And the valve is a 16ga steel plate butterfly valve - totally indestructible.
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