The Doc is correct. When you install this along with the bolt, be sure that the intake-to-timing cover rubber washer is in place. A schmear of sealer helps here. And if the intake manifold was removed, tighten that long bolt FIRST before the manifold bolts. It pulls the manifold closer to the timing cover so the washer is compressed and seals nicely. If you tighten the manifold bolts before that timing cover bolt, the washer may leak and drive you crazy. Ask me how I know.