340 crank- cast or forged? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-04-2003, 09:25 PM
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340 crank- cast or forged?

I need an opinion from a more experienced hotrodder.

I will be building a mild 340 for a street car (3400 lbs automatic tranny). I hope to make an honest 325 HP at the flywheel.

Would a forged crank turned 20/30 be strong enough?

Would a standard cast crank (1973 340) be strong enough?

Which would be best?

Thanks in advance!

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Old 10-04-2003, 09:36 PM
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nothing wrong with a .020-.020 steel crank,better than cast anyday.
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Old 10-04-2003, 09:57 PM
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Call Hensley.

www.hensleyperformance.com
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Old 10-05-2003, 02:10 PM
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either would work just fine for ya if you go with the just be careful you get the proper flex plate and balancer as I believe the 73 cast crank was external balance
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Old 10-06-2003, 07:48 AM
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Yes, both would work fine, But as well as a Flex plate, the 73 crank needs a Balanced Flywheel or Torque-converter, and a balanced Damper.If the cast crank doesn't have these, it won't be long before it breaks. The 73 Cast crank was Shot peened and is stout enough for any street duty. I'm Building a 73 340 right now for my Challenger.
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