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Re: Replace exhaust manifold bolts?
If it was mine (I have a 2003) I wouldn't replace any of them at this point. I go with the old saying "if it ain't broke, don't fix it". That split is normal in the manifold. As for power that 6.0 should pull just fine, it may be time for a little fuel injector cleaner and some new filters. At 60K miles that engine is just barely broken in, these things are good foe 200K plus with very minor maintenance. If you do decide to replace the bolts, have the engine at operating temperature before you loosen them. A common mistake is trying to break them loose on a cold engine.
Just my 2 cents,
Rob
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