This splitter works fine but cranks are better off if they are 2.25 or larger in diameter at the big end. Is it too big for a Chevy 489 Big Block? No way does this work on any small blocks. It only fits my cranks without bearings. After checking the play in the bearing, I can't use it to split the stem with the bearing installed. Whoever came up with that is an idiot. Make it 1.75 inches
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