BBC crank with small rod journals
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BBC crank with small rod journals

  1. #1
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    Default BBC crank with small rod journals

    I aquired a BBC crank with small block rod journals. Did not know it at the time. Closing machine shop, owner passed away. Price was to good to be true. New in box

    Crower crank 4.25 stroke

    Why would someone do that?

    Is it usefull?

    Do I replace it, or the rods?

    Jerry

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    steelcomp was here
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    Quote Originally Posted by billet racing View Post
    I aquired a BBC crank with small block rod journals. Did not know it at the time. Closing machine shop, owner passed away. Price was to good to be true. New in box

    Crower crank 4.25 stroke

    Why would someone do that?

    Is it usefull?

    Do I replace it, or the rods?

    Jerry
    Lighter rod journals, lighter rods and slower bearing speeds are a few reasons. Sure it's useful. If you don't want it, let me know.
    Rods are available. Callies makes a Compstar in 6.385" x 2.100" which would be your typical rod in a 4.25" stroke standard deck engine. We are a Callies dealer now.
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    gn7
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    Like Steel said, it is reasonably common. Besides the reasons Steel mentioned, due to the rod being lighter, as well as a slight weight reduction of the throw itself, they can make the counter weight slightly smaller reducing the windage a little.

    Callie, Compstar, Oliver, Carrillo, Crower, and Eagle all make 6.385 long rods for it.

    If you do decide to go with a standard crank, between Steel and myself I am sure you can unload it.



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    www.highflowdynamics.com LakesOnly's Avatar
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    Cool

    Absolute non-issue. I am even aware of OEM cast crankshafts that are stroked to 4.25" 2.100". In fact I'm building an engine that way right now, albeit low hp.

    LO

    P.S.: We have an OEM BBC 3.76" stroke 396/427 forging over here that has been stroked to 3.825"/2.100", if anyone's interested.
    Last edited by LakesOnly; 10-07-2013 at 10:31 AM.
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    Default crank

    Intended on using it with my tall deck block, twin turbo set up. for a 21' Daytona jet. If it's still usable, new rods would be cheaper than a new crank. But which is better for my intended purpose?

    Jerry

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    gn7
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    Quote Originally Posted by billet racing View Post
    Intended on using it with my tall deck block, twin turbo set up. for a 21' Daytona jet. If it's still usable, new rods would be cheaper than a new crank. But which is better for my intended purpose?

    Jerry
    You will be limited to Crower(maybe) Oliver or Carrillo rods. That tall deck is going to require a 6.535 (+.400) rod minimum. I don't know of any other companies other than those making SBC journal rods in lengths other than 6.385(+.250) outside of custom rods.



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    Quote Originally Posted by gn7 View Post
    You will be limited to Crower(maybe) Oliver or Carrillo rods. That tall deck is going to require a 6.535 (+.400) rod minimum. I don't know of any other companies other than those making SBC journal rods in lengths other than 6.385(+.250) outside of custom rods.
    I got some 6.405 billet rods from Crower.
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    gn7
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    Quote Originally Posted by EVILFORCE View Post
    I got some 6.405 billet rods from Crower.
    With SBC big end??
    Still a little short for a tall deck. The piston would have to be custom, and considerably heavier that need be.



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    Last edited by gn7; 10-07-2013 at 11:33 AM.

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    Quote Originally Posted by gn7 View Post
    You will be limited to Crower(maybe) Oliver or Carrillo rods. That tall deck is going to require a 6.535 (+.400) rod minimum. I don't know of any other companies other than those making SBC journal rods in lengths other than 6.385(+.250) outside of custom rods.
    Callies has one in their Ultra I beam which IMO is one of the best rods on the market today. They also have the Custom Age rod bolt upgrade.
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    gn7
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    Quote Originally Posted by steelcomp View Post
    Callies has one in their Ultra I beam which IMO is one of the best rods on the market today. They also have the Custom Age rod bolt upgrade.
    So they do.
    You don't have to convince me of the Callies Ultra. I told you I was running them over 2 years ago, and told you then I thought they were the best rod on the market for the buck. Still do. We used them in the motor for the 2012 season. I discovered them somewhat by default because they make a length that is not all that common that I needed for a build. Bill bought a set the same length for the 540 we're building for his 27ft. Wish I knew you guys were going to become dealers for them. Now I know. I'll keep it in mind. I am hooked on the things.



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    Last edited by gn7; 10-07-2013 at 01:22 PM.

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    Default Cheap Inches

    This is a combination we used in many years ago in GN. A tall (truck) block, .o6o over(4.311), 4.25 stroke, a 6.385 rod (+.250), and a 454 piston. That comes to 496ci. with easy to get parts. Slower bearing speeds, lighter rods, less spinning mass, easy to find parts, it's a good combo. Love those cranks. That's right Bob, old school GN...
    Last edited by phughes SS-13; 10-07-2013 at 09:04 PM.

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    Quote Originally Posted by phughes SS-13 View Post
    This is a combination we used in many years ago in GN. A tall (truck) block, .o6o over(4.311), 4.25 stroke, a 6.385 rod (+.250), and a 454 piston. That comes to 496ci. with easy to get parts. Slower bearing speeds, lighter rods, less spinning mass, easy to find parts, it's a good combo. Love those cranks. That's right Bob, old school GN...
    That would require a little decking and one heavy ass piston.

    I prefer a 6.66 rod and off the shelf 454 piston with a 1.395 CH that's normally used for a 454 with a 6.385 rod. Better rod ratio, lighter piston. and all still off the shelf parts.
    That's right, "NEW" school GN

    I'll leave out the 6.8 rod with the low deck 496 1.27 CH piston assembly put in a tall deck.



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    Last edited by gn7; 10-07-2013 at 10:02 PM.

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    Default Bbc

    I've been using a 6.58 rod, with the pin in the oil ring groove. Light weight. Have two sets of rods, new alum, and older (12 years) Oliver. Was intending on using the alum.

    Jerry

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