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Old 12-02-2012, 12:26 PM
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Completely untrue. Keep in mind the components in contat with combustion are are feeling 1200 degree exhaust gases. Just because our subjective interpretation of 70 degrees is "warm" and 30 degrees is "cold" doesn't mean the stainless steel in your valves is going to notice. 40 degrees compared to 1200 is a drop in the bucket, and probably won't make almost any difference in how long it takes the valves to reach ambient temp.

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