Small Block Chevy – Ultra UD – Forged

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  • Small Block Chevy - Ultra UD - Forged-image
  • Small Block Chevy - Ultra UD - Forged

  • The Callies Ultra UD crankshaft family represents the most reliable and highest performing evolution in shaft design for naturally aspirated applications. Machined from Callies American made 4330 bar stock or proprietary 4340 forgings, this crankshaft was specifically designed for circle track and endurance racing where the least amount of reciprocating weight is demanded, while not sacrificing strength. Improvements over the outgoing XB and XL cranks include more robust pin arms to decrease torsional fatigue, radially narrowed counterweights (versus pendulum-cut), as well as more material around the centerline to virtually eliminate flexing. These changes come together to make the best endurance crankshaft available so that your engine runs better, for longer.

  • Ultra UD - Forged

    Standard Features

    • Stroke range from 2.600” to 4.250”
    • Several rod journal configurations available
    • 283, 350, 400 main journals available
    • SBC post standard, BBC post optional
    • All rod journals lightened and mains gun-drilled
    • 6 counterweight design
    • Full internal balance available upon request
    • Narrowed counterweight profile for reduced weight and windage; benefits tremendously from light bobweights
  • Ultra Dirt/Oval - SBC Forged Crankshaft
     Stroke   Main   Pin   Cammed for rod length   Part # 
    3.335 350 1.888 5.700 SAX-19A-UD
    3.335 350 2.000 5.700 SAX-14A-UD
    3.480 350 1.888 5.700 SAF-19A-UD
    3.480 350 2.000 5.700 SAF-14A-UD
    3.500 350 1.888 5.700 SAG-19A-UD
    3.500 350 2.000 5.700 SAG-14A-UD
    3.750 350 1.888 6.000 SAJ-19A-UD
    3.750 400 2.000 6.000 SAJ-24A-UD
    3.800 400 2.000 5.850 SAK-24A-UD
    3.800 400 2.000 5.850        BBC Post SMK-24A-UD
    3.875 350 2.000 6.000 SAM-14A-UD
    3.875 400 2.000 6.000 SAM-24A-UD
    4.000 350 2.000 6.000 SAO-14A-UD
    4.000 400 2.000 6.000 SAO-24A-UD
    4.000 400 2.000 6.000        BBC Post SMO-24A-UD
      ** Only a partial listing of the available part numbers is listed here. Contact our sales team for a full list. 419-435-2711  Ultra UD Billet - Dirt/Oval Crankshafts are also available. 
  • « Back to Catalog
  • Small Block Chevy - Ultra UD - Forged-image
  • Small Block Chevy - Ultra UD - Forged

  • The Callies Ultra UD crankshaft family represents the most reliable and highest performing evolution in shaft design for naturally aspirated applications. Machined from Callies American made 4330 bar stock or proprietary 4340 forgings, this crankshaft was specifically designed for circle track and endurance racing where the least amount of reciprocating weight is demanded, while not sacrificing strength. Improvements over the outgoing XB and XL cranks include more robust pin arms to decrease torsional fatigue, radially narrowed counterweights (versus pendulum-cut), as well as more material around the centerline to virtually eliminate flexing. These changes come together to make the best endurance crankshaft available so that your engine runs better, for longer.

  • Ultra UD - Forged

    Standard Features

    • Stroke range from 2.600” to 4.250”
    • Several rod journal configurations available
    • 283, 350, 400 main journals available
    • SBC post standard, BBC post optional
    • All rod journals lightened and mains gun-drilled
    • 6 counterweight design
    • Full internal balance available upon request
    • Narrowed counterweight profile for reduced weight and windage; benefits tremendously from light bobweights
  • Ultra Dirt/Oval - SBC Forged Crankshaft
     Stroke   Main   Pin   Cammed for rod length   Part # 
    3.335 350 1.888 5.700 SAX-19A-UD
    3.335 350 2.000 5.700 SAX-14A-UD
    3.480 350 1.888 5.700 SAF-19A-UD
    3.480 350 2.000 5.700 SAF-14A-UD
    3.500 350 1.888 5.700 SAG-19A-UD
    3.500 350 2.000 5.700 SAG-14A-UD
    3.750 350 1.888 6.000 SAJ-19A-UD
    3.750 400 2.000 6.000 SAJ-24A-UD
    3.800 400 2.000 5.850 SAK-24A-UD
    3.800 400 2.000 5.850        BBC Post SMK-24A-UD
    3.875 350 2.000 6.000 SAM-14A-UD
    3.875 400 2.000 6.000 SAM-24A-UD
    4.000 350 2.000 6.000 SAO-14A-UD
    4.000 400 2.000 6.000 SAO-24A-UD
    4.000 400 2.000 6.000        BBC Post SMO-24A-UD
      ** Only a partial listing of the available part numbers is listed here. Contact our sales team for a full list. 419-435-2711  Ultra UD Billet - Dirt/Oval Crankshafts are also available. 

Sales: 419.435.2711

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