How much grinding to make a bbc 4.75 crank fit?
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How much grinding to make a bbc 4.75 crank fit?

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    MLC - Mid Life Crisis probablecause's Avatar
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    Default How much grinding to make a bbc 4.75 crank fit?

    How much grinding to make a bbc 4.75 crank fit? I have a 4 bolt, gen IV, block that I am looking to stroke the crap out of. Thanks, BK

    Just my opinion, but maybe it's time for the government to take down the bird feeder!


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    Quote Originally Posted by probablecause View Post
    How much grinding to make a bbc 4.75 crank fit? I have a 4 bolt, gen IV, block that I am looking to stroke the crap out of. Thanks, BK

    stock gen 4 4 bolt...start with a couple of inches of concrete cause ur gunna hit the h20 jacket before it clears....and probably also smack the cam with a 4 3/4 stroke....4.5 about it for stroke in a stocker and I would sonic check the rail area after ur done hogging it out... oh u could possibly nick the main oil galley 2...if ur set on a 4 3/4 deal start with a aftermarket raised cam block and kind of pointless to run a small bore with that many inches, just go with 4.500 or 4.600 and be done with it.

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    Amber Racing Services BUSBY's Avatar
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    You can't. There isn't enough room.

    You'll grind right into the oil passages right next to the pan rail (where the pan bolts to the block ... there are oil passages that run through the block all the way down the sides).

    Sorry, been there ... did it ... ruined a block or two.

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    gn7
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    Quote Originally Posted by probablecause View Post
    How much grinding to make a bbc 4.75 crank fit? I have a 4 bolt, gen IV, block that I am looking to stroke the crap out of. Thanks, BK
    Let me guess, you want to do this with a standard deck heigth block too



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    Quote Originally Posted by gn7 View Post
    Let me guess, you want to do this with a standard deck heigth block too

    LOL....and use 6.135 rods......

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    Quote Originally Posted by BUSBY View Post
    You can't. There isn't enough room.

    You'll grind right into the oil passages right next to the pan rail (where the pan bolts to the block ... there are oil passages that run through the block all the way down the sides).

    Sorry, been there ... did it ... ruined a block or two.
    Or two? What, you didn't figure it out on the first one?
    Sorry...couldn't resist.
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    Quote Originally Posted by steelcomp View Post
    Or two? What, you didn't figure it out on the first one?
    Sorry...couldn't resist.
    it wasn't a 4.75 crank ... 4.5

    and a 4.5 can just barely fit ... but as soon as you've gone too far, you've gone too far.

    4.25 is the biggest I would go on a stock block anymore

    you know what they say though, you'll never know how far you can go until you try

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    Well then I guess my 5.00 crank question doesn't apply...

    Just my opinion, but maybe it's time for the government to take down the bird feeder!


    Quote Originally Posted by Rexone;
    Try to ignore the haters, they are everywhere, just as in life.
    Quote Originally Posted by Pronstar;
    Liberalism: Logic's retarded cousin.


  11. #9
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    We fit a 4.375 in a Gen V Bowtie.
    Standard deck.

    Only cuz Callies had a sale on 1 piece rear seal cranks lol

    But it was a late model block and we hacked it up pretty good and rod stroke ratio sucked and tons of mallory from getting the counterweights down far enough to clear.

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