Is this for a Ford Vulcan 3.0 by any chance? I had the choice of using this gasket or a standard paper one but I noticed with this one, the way it would mate up to the housing surface...there was a raised ridge on the housing of which elastomer would have to be lined up perfectly for it to not leak. Maybe I am overthinking it but I went with the standard paper gasket instead. With the paper, there was a slight leak for a few days then stopped, of which I'm guessing is due to the fiber material expanding and settling for a bit.