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Drive the car a day or so, then go back and retighten the header bolts, because after the first heat cycle the bolts might loosen, creating an exhaust leak. In some spots a 1/4 drive ratchet with a 7/16 deep-well socket can be used, but when it gets tight, use a small 7/16 open-end wrench.
1987 Ford Mustang LX Exhaust System Upgrade

 Drive the car a day or so, then go back and retighten the header bolts, because after the first heat cycle the bolts might loosen, creating an exhaust leak. In some spots a 1/4 drive ratchet with a 7/16 deep-well socket can be used, but when it gets tight, use a small 7/16 open-end wrench.  View Related Article

 

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