350 cast steel crank - Team Camaro Tech
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post #1 of 7 (permalink) Old Mar 24th, 01, 12:08 PM Thread Starter
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I have a guy that worked at a engine rebuilder shop telling me that there is 3 kind of 350 crank, cast, cast steel, forged steel, he is trying to sell me some over stock cast forged cranks after the shop had closed down.#3932442

69 camaro conv. SS 396 th400. matching numbers, hugger orange, white top, white houndstooth int.(changed color combo)
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post #2 of 7 (permalink) Old Mar 24th, 01, 03:04 PM
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Two kinds.
1) Cast.
2) Forged.
The #2442 is a cast crank.

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post #3 of 7 (permalink) Old Mar 25th, 01, 04:33 AM
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But you still see aftermarket advertisers list a "cast steel" crankshaft, like it is a middle grade crank between just cast and forged.

I would imagine is has to do with the material it is produced from...?

1969 Nova SS 350
13.82 at 105
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post #4 of 7 (permalink) Old Mar 25th, 01, 05:45 AM
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"Cast Steel" is an upgrade material to cast iron and is stronger, but were never made by Chevrolet; OEM cranks were all either cast nodular iron or forged steel.

'69 Z28 Fathom Green
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post #5 of 7 (permalink) Old Mar 25th, 01, 07:21 AM
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easy way to tell cast from forged, tap a counterwieght with a wrench. cast will ring a short note, forged will ring like a bell.
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post #6 of 7 (permalink) Old Mar 25th, 01, 10:27 AM
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Even easier way to tell cast from forged. On a cast crank there is a casting mark on the bottom of the flywheel flange. On a cast crank it is a narrow mark (like 1/16") on a forged crank it is wider (like a 1/4").

BTW - I personally think that forged cranks are overrated for all but serious race motors. A well balanced cast crank is reliable to at least 6000 RPM in a street application.
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post #7 of 7 (permalink) Old Mar 26th, 01, 05:12 AM
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this is true, cast cranks and 2 bolt blocks are said to be safe up to 600 h.p., its the peace of mind though.
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