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Flywheel anomoly

PostPosted: Sun Jul 02, 2017 6:14 pm
by gjz30075
Hi all. I recently bought this C8ZE flywheel (with a C7ZE-B stamped on the outer ring) and wondered about the spiral on the mounting boss. What
purpose would it serve when this area is bolted up against the butt of the cranshaft?

Well, it seems I cannot upload my pic for some reason but to describe it - it's a slightly grooved spiral 'cut', starting from the innermost hole and wrapping
around and ending at the outer edge of a bolt hole, or, ie, the outer edge of the mounting area. Hope that makes sense.