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  • 2 Post By Dave Severson
  • 2 Post By 34_40
  • 5 Post By rspears
  • 1 Post By 34_40

Thread: Is this forged crank that was damaged still good to go?
          
   
   

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  1. #1
    69elko's Avatar
    69elko is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 1969 El Camino SS396 350HP
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    Is this forged crank that was damaged still good to go?

     



    Would you use this crank in your 350? It's a GM FORGED #1182 350 crank. I'm going to have it magnafluxed and inspected by a machine shop and if it checks out good I'll have it ground 10/10. I mocked it up in the engine and it spins freely. I'm thinking maybe worse case scenario some heavy metal has to be added to the crank to balance it properly? Either way I'm in it $75 bucks and a new Scat cast steel is $300 plus I would still need to balance that crankshaft too.

    IMG_20221129_194017159.jpg

  2. #2
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    It's hard to tell off the picture, but if it passes a crack check and will balance properly I would use it. Looks like maybe a rod tried to escape?
    NTFDAY and glennsexton like this.
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  3. #3
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    Yes, what Dave said. If it only has surface damage and no cracks, grind it / buff it / balance it. Your machine shop I'm sure will guide you through what it needs.
    Dave Severson and NTFDAY like this.

  4. #4
    69elko's Avatar
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    I think a rod broke from the looks of it. The main damage is only on the 1 counter balance weight with some very slight nicks in 1 maybe 2 other spots. I've heard of people using these forged 1182 gm cranks to low 10s in the 1/4 mile with nitrous so I wanted to at least give it a shot.

  5. #5
    69elko's Avatar
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    Should I take my Dremel to it and take off any sharp edges and polish up the counter weight before I take it in to get machined?

  6. #6
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    Quote Originally Posted by 69elko View Post
    Should I take my Dremel to it and take off any sharp edges and polish up the counter weight before I take it in to get machined?
    I wouldn't do anything to it. Leave it as is and let the machine shop take care of it. Point out the sharp places and tell them you left it alone for them to address. Just my $0.02.
    Roger
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  7. #7
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    Quote Originally Posted by 69elko View Post
    Should I take my Dremel to it and take off any sharp edges and polish up the counter weight before I take it in to get machined?
    I don't think I'd bother.. you don't want to "work" on 1 spot to much. Let the machine shop do the mendo blendo when they balance it. Sometimes when a guy starts on a spot he can go to far chasing a "flaw" and cause more of an issue.. my 2 cents! Are you going to knife edge the crank counter weights? I wouldn't think so but, it popped into my head.
    Dave Severson likes this.

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