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I have a crankshaft out of a 400 small block, and I wanted to know if it's cast or steel. How do you tell the difference? ...If it's steel I'm building a 383...
 

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tap on the counter weight with the shank of a screwdriver...if it sounds like your tapping a brick then the crank is cast...if it rings when you tap on it...its a steel crank;)
 
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