Crankshaft

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Crankshaft

Post by smoken340 on Thu Sep 01, 2016 10:48 am

On the 70/71- 340 engine, what is considered better, the steel crank or the forged crank?

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Re: Crankshaft

Post by philcollins on Thu Sep 01, 2016 2:23 pm

340 up to middle of 1972 used a forged steel crankshaft. After , they use a cast iron crank.


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Re: Crankshaft

Post by smoken340 on Thu Sep 01, 2016 5:11 pm

Thank You sir.

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Re: Crankshaft

Post by crankycrow on Wed Nov 16, 2016 5:39 pm

philcollins wrote:340 up to middle of 1972 used a forged steel crankshaft. After , they use a cast iron crank.



cast steel not cast iron big difference .

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Re: Crankshaft

Post by smoken340 on Wed Nov 16, 2016 5:52 pm

The casting date on my engine is 6/15/71.
So what should it have ?

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Re: Crankshaft

Post by philcollins on Wed Nov 16, 2016 6:19 pm

Forged steel. Do you have the harmonic damper?

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Re: Crankshaft

Post by smoken340 on Thu Nov 17, 2016 4:45 am

philcollins wrote:Forged steel. Do you have the harmonic damper?

Yes I do have it.

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Re: Crankshaft

Post by philcollins on Thu Nov 17, 2016 5:34 am

What's the part number on it?

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Re: Crankshaft

Post by smoken340 on Thu Nov 17, 2016 8:15 am

This is the only number that I could find. 83184-319-1

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Re: Crankshaft

Post by philcollins on Thu Nov 17, 2016 8:21 am


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Re: Crankshaft

Post by crankycrow on Thu Nov 17, 2016 1:29 pm

smoken340 wrote:The casting date on my engine is 6/15/71.
So what should it have ?



this engine would be used in a 72 model year car .

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Re: Crankshaft

Post by smoken340 on Thu Nov 17, 2016 1:58 pm

crankycrow wrote:
smoken340 wrote:The casting date on my engine is 6/15/71.
So what should it have ?



this engine would be used in a 72 model year car .

To my understanding, because it was cast mid year 1971, then it would have the most desirable crank, Forged Steel.

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Re: Crankshaft

Post by philcollins on Thu Nov 17, 2016 7:55 pm

Exactly, the cut-off date to cast crank is around april 1972.

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Re: Crankshaft

Post by crankycrow on Fri Nov 18, 2016 10:44 am

if you have a good pic of the crank and throws I can tell you if it is forged or not .

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Re: Crankshaft

Post by smoken340 on Fri Nov 18, 2016 12:50 pm

crankycrow wrote:if you have a good pic of the crank and throws I can tell you if it is forged or not .

Oil pan is off the engine, but the crank is still installed, including all pistons. So I don't know if a picture like that would be helpful or not.

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Re: Crankshaft

Post by crankycrow on Fri Nov 18, 2016 5:55 pm

smoken340 wrote:
crankycrow wrote:if you have a good pic of the crank and throws I can tell you if it is forged or not .

Oil pan is off the engine, but the crank is still installed, including all pistons. So I don't know if a picture like that would be helpful or not.


worth a try .

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Re: Crankshaft

Post by smoken340 on Fri Nov 18, 2016 6:01 pm

I'll get one tomorrow

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Re: Crankshaft

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