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4.Only six bolts are used to affix the manifold to the head. We removed all but one center bolt. After making sure it was less than finger tight, we removed the bolt while holding the exhaust manifold with the other. Once it was released from the head, we carefully removed the stock gasket and removed the manifold from the truck. We kept the thick plastic wrap on our new headers to keep the coating from being scratched. This truck has less than 6,000 miles on it, so we opted to reuse the stock gaskets. Start with a center bolt when installing the new headers to ensure the headers seal properly.