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4340 eagle crank

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Post  tampa red February 5th 2010, 10:46 pm

Im thinking about buying an 4340 eagle crank that's been turned .010 on the mains. Is there a disadvantage or a problem with this being done. What about bearings to get the correct clearance? An additional .001, would that be .010stdx?
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Post  the Coug February 6th 2010, 9:26 am

what stroke?



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Post  dfree383 February 6th 2010, 9:39 am

If it was ground by a competent shop and has been checked out their is no problem getting bearings. Factory Eagle machine work is rather Sloppy and inconsistant for the most part.
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Post  the Coug February 6th 2010, 10:03 am

dfree383 wrote:If it was ground by a competent shop and has been checked out their is no problem getting bearings. Factory Eagle machine work is rather Sloppy and inconsistant for the most part.


so true plus if it a stock stroke just get a factory cast and run the hell out of it, they are strong as hell....


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Post  bbf-falcon February 6th 2010, 11:19 am

What about bearings to get the correct clearance? An additional .001, would that be .010stdx?
Thanks[/quote]

I think that would be correct if the journal is .010. Call Lem Evans to be sure. They may be hard to find in a .010x. King bearings would be your best chance of having it.If they can be found,Lem or Adney can find them. www.bfevansraceparts.com

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Post  tampa red February 6th 2010, 11:37 am

The stroke is a 4340 4.500 turned down by eagle. I guess because of a mistake. I'm wondering if the nitride was ground away or do they or did they renitride it?
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Post  the Coug February 6th 2010, 11:56 am

is it a sell from Eagle or someone have it there handy? if so I would check it out Mic the rods and mains to make sure they are correct and round, as stated some of their work is shoddy at best.... and some is spot on, only way to make sure is double check it..... and ask if the Nitride is on or if they Nitrided it after they ground it! Blake had one of their cast cranks and it was a flexible crank it flexed like a mad man in his engine, I think the 4340 would be alot better.....



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