Quote:
Originally Posted by cody
Yah, that's the issue. The "casting button" (raised bump on the manifold that is thicker than the rest of the pipe) where I tapped the original hole years ago is not wide enough to provide a flat seating surface around the larger hole I had planned to tap for the straight bolt. So by the time I tapped the larger hole, the casting button would be almost gone and I'd probably have to grind it off completely to create a flatish surface for the washer[s] to seal.
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Ahh. Yeah, a crush washer will not work. They are used in conjunction with a smooth, flat surface perpendicular to the hole's axis. You would not be able to create one smooth enough with a grinder, they are normally milled out.