My experience has been that they just last a helluva lot longer than if they're not, plus underhood temps are cooler. The other option is to just get stainless headers, which is the route I'm going when my blown 408 is underway.
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Capri306, Moderator
The Mustang Works Online
1979 Mercury Capri
1987 5.0L Mustang LX Notchback
1993 5.8L Eddie Bauer Bronco
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