340 Engine Shake

plumkrazee70 said

I took the valve covers off yesterday and didn't notice anything broken as I thought the same thing. Is there something I can do besides a visual? Here is all my crank pictures that I have.

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Strange you dont see alot drill holes in the crank counter weights. I only see one in the pic's.
Most balanced crankshafts will have material removed from the counter weights to balance out the assemble. The machinist will use a drill or an end mill to accomplish this and the marks are very visable.