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Anyone know why the OEM Manual states to replace the manifold studs on a '09 2.3 Duratec when replacing the manifold? ???

Thanks,
Richard
 

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I'll guess that they are torque to yield. Don't know for sure.
 

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the head bolts are torque to yield. I'd reuse the exhaust manifold bolts if they are grade 8's. if not then replace em' they're pretty cheap.
 

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The OP is saying studs. I can't see why not re-use studs but....?
 
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