After you install the pyrometer fitting into the new exhaust manifold, you can install it. Snaking in the manifold involves keeping several of the bolts in place as you install it. No exhaust gasket is used, but a light coating of grease on the mounting surfaces will carbonize and seal some imperfections. We used some card paper on the bolts to hold them in place. The paper was then pulled off after the bolt was started in the head. Note also that antiseize was used on the bolts. Note the differences between the original manifold (top) and the new Banks piece (bottom).