Worn Crank Snout

Discussion in 'Rotating Assemblies' started by Grumpy, Jul 9, 2019.

  1. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    its a P.I.T.A., but parts wear out, but you have options, a decent machine shop can weld and re-machine the crank snout ,
    obviously that requires total engine disassembly , and yes it might be faster and cheaper to buy a replacement crank or use the opportunity to upgrade to a stroker crank assembly,
    since you will already be forced to do a total re-assembly/rebuild ,
    you can rebuild a 327 or look at this as an opportunity to find a machine shop that can sell you a cheap 350-383 rotating assembly,
    yeah, any crank assembly must match your blocks main journal size and rods must match the crank,
    and pistons must have the correct deck height,diameter and rods must also match the application.
    you can,t randomly interchange components, some thought must go into the selection process.
    you could certainly gain a significant boost in performance if you selected a 3.75" stroke crank to replace the 3.25" stroke crank the 327 had,
    and matched pistons and connecting rods and the correct journal sizes to match.

    [​IMG]
    why not call a few local machine shops,
    lots of old school machine shops have short blocks and cranks that got dropped off and never picked up,
    call a few, too see if they have a small journal 327 crank in inventory,
    around here I called a few and about $375 is the going price ,on a used 327 crank,
    I did not get into the details,
    but that certainly seems about right
    yeah they might be .010/.010 under size but certainly new bearings and a new crank gets you back running, but if I was potentially going through all that work
    a rebuilt 350 short block might be not much more expensive, if you trade in your 327 block,

    http://garage.grumpysperformance.com/index.php?threads/damper-tool.223/#post-260

    http://garage.grumpysperformance.com/index.php?threads/damper-honing.4975/#post-13912

    http://garage.grumpysperformance.com/index.php?threads/scat-cranks-related-info.10930/

    http://garage.grumpysperformance.com/index.php?threads/can-i-get-it-polished.9214/#post-91962

    http://garage.grumpysperformance.com/index.php?threads/think-thru-your-goals.10606/#post-73288

    http://garage.grumpysperformance.com/index.php?threads/repair-or-replace-350-crank.14181/#post-71931

    http://garage.grumpysperformance.com/index.php?threads/bits-of-383-info.38/page-2#post-61958

    http://garage.grumpysperformance.com/index.php?threads/bearing-clearances.2726/

    http://garage.grumpysperformance.com/index.php?threads/bearing-clearances.2726/

    http://garage.grumpysperformance.co...ould-you-build-a-350-or-a-383-sbc-combo.8310/


    Chevy Smallblock V8 Crankshaft Journal Sizes


    Gen.I, "Small Journal"
    265...Mains-2.30"-Rods-2.00"
    283...Mains-2.30"-Rods-2.00"
    302...Mains-2.30"-Rods-2.00"
    327...Mains-2.30"-Rods-2.00"




    Gen.I, "Medium Journal", includes "Vortec" 305 and 350 thru '98
    262...Mains-2.45"-Rods-2.10"
    267...Mains-2.45"-Rods-2.10"
    302...Mains-2.45"-Rods-2.10"
    305...Mains-2.45"-Rods-2.10"
    307...Mains-2.45"-Rods-2.10"
    327...Mains-2.45"-Rods-2.10"
    350...Mains-2.45"-Rods-2.10"
     
    Last edited: Feb 18, 2021

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