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Answer for Firstgen
The parting lines on a forged crank are wide and flat, while on a cast crank they will be thin and raised slightly. Also, if the crank is out of the block, if you tap a forged crank with a hammer it will ring like a bell-- cast crank, a dull thud.
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We made Oklahoma a little after 3, Randy & his brother Bob & my old GMC...
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