I'll chime in on this one.  I heard something about this last weekend.  Breaking in an engine will do something to coated headers.  I think it will fog them really quick if I remember correctly.  I bought a set of the Dynomax ceramic coated headers and put them on a fresh big block pushing over 500 HP, and they fogged within a week.  I would follow the directions and not use them on a fresh motor.

Tom

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