427 chevy forged crank
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427 chevy forged crank

  1. #1
    Choking my ....... beerjet's Avatar
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    Default 427 chevy forged crank

    6223 casting . Came out of a running motor . $200
    In Rancho Cucamonga (909)322-6708
    Last edited by beerjet; 09-22-2008 at 05:06 PM.

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    Quote Originally Posted by beerjet View Post
    6223 casting . Came out of a running motor . $200
    In Rancho Cucamonga (909)322-6708
    std/std or does it need to be turned?

    FastRat

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    Choking my ....... beerjet's Avatar
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    It measured :
    2.740 mains
    2.180 rods

    At least thats what my calipers said

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    Choking my ....... beerjet's Avatar
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    Quote Originally Posted by beerjet View Post
    It measured :
    2.740 mains
    2.180 rods

    At least thats what my calipers said
    by what i'm told, the crank is junk!...mains are favorable, but rods are .040 under!!!...way too far to take a chance...not worth the price ur asking!

    FastRat

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    Standard Big Block Chevy Rod Journals are 2.200 which would make this .020 under, not .040.

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    Quote Originally Posted by insanity View Post
    Standard Big Block Chevy Rod Journals are 2.200 which would make this .020 under, not .040.
    True .

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    Quote Originally Posted by FastRat View Post
    by what i'm told, the crank is junk!...
    If it passes mag it ain't junk!..

    Good for a bump!..

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    Default Typo

    I think there was a typo about what std/std is. A 20/20 steel crank is usable. Is it cross drilled? or a 396............MP
    LOUD BOATS SAVE LIVES

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    Quote Originally Posted by insanity View Post
    Standard Big Block Chevy Rod Journals are 2.200 which would make this .020 under, not .040.
    i did some research on this & according to HP Books: "Big Block Chevy Marine Performance by Dennis Moore, on pg 23 is the following: "the dimensions of "all" crankshafts "are" the same. the stroke is 4.0". the main bearing diameter is 2.750" and the rod journal diameter is 2.220"."...with that said!, lets do a little math!...rod journal 2.220"-2.180"= .040 under... therefore in my eyes, regardless of whether it cks out mag wise, it is not worth useing in a HP application! ...i rest my case, until u prove me wrong!

    FastRat

  13. #11
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    Apparently there was a typo in the book.

    Having measured hundreds of bbc cranks, even though the "spec" might be 2.200",, usually they will be 2.199x", with x being 1/10,000".

    The Kryptonite crank I currently have on the bench is .010" under on the rod journals, measures 2.1890"-2.1892" on all the journals.

    Omar stated that he used calipers, so 2.180 is going to be a very rough measurement, but .020" undersize.

    A .010/.020 steel crank is certainly not junk. The big advantage of a std/std crank is the ability to use .001" oversize and undersize bearings as required to get close tolerance bearing clearances.

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    A legend to the DNR vdrive502's Avatar
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    Fast Rat has a point there but it could be used in a stock low HP motor with no problems as long as you are not a lead foot.

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    Choking my ....... beerjet's Avatar
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    Took it to a machine shop and it measured 10/10

    $200

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