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If your wondering if knife edging a crank weakens it, the answer is NO.
The webs aren't stressed. You will find many deep holes drilled in them from the factory for balancing. Much worse than edging.
You can take as much weight out of the webs without jeopardising the integrity of the crankshaft.
If you gun drill the journals or pins then you will weaken it and have to nitride treat it.
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