Greg Fletcher
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If installing a new header, I've found it helpful to cut off the old one with a sawsall as close as possible to the head. This can save a few hours of torment. Of course, best to install a new unit on the engine before hand at your next engine refresh, while the engine is out of the car. I also coat the manifold gasket with Aviation Gasket Sealer to prevent blowout (not uncommon on the 907). The smaller outside diameter copper lock nuts are cheap insurance and install much easier than the original nuts.
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