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Old 01-15-2006, 08:28 AM
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How do you tell if a crank is steel or cast

have 327 truck motor 66 model
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Old 01-15-2006, 08:37 AM
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Read the number off the crank and look here:

http://www.mortec.com/cranks.htm

All small journal 327 GM cranks are steel.
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Old 01-15-2006, 08:57 AM
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cast parts have a thin casting seam. where the 2 pieces of the sand mold come together.
a forged part has a thicker seam line. where the 2 halves of the stamping machine come together to hammer the forging.
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Old 01-15-2006, 09:18 AM
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Forgings usually have their wide parting lines ground down. On a casting this is not necessary, so you will see the parting line as a raised ridge.
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Old 01-15-2006, 11:30 AM
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I find the easiest method is visual rather than checking numbers. As mentioned the first visual is the casting or parting line. Thin for cast, wide for steel. Second is the sound. Stand it on it's flange tap it with a steel object. A flat sound is cast (or a steel crank with a crack), a sharp ringing sound is a steel crank.

Vince
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Old 01-15-2006, 02:14 PM
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Other way around I thought; a singing crank is cast. A forged crank has a thud.
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Old 01-15-2006, 04:28 PM
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Quote:
Originally Posted by curtis73
Other way around I thought; a singing crank is cast. A forged crank has a thud.
Nope.

Vince
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