LS – Ultra UD – Billet

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  • LS - Ultra UD - Billet-image
  • LS - Ultra UD - Billet

  • 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 Dirt - LS - Billet

    Standard Features

    • Stroke range from 2.720” to 4.250”
    • Fully Counterweighted
    • Counterweight prepped for 1850g bob weight
    • Gun drilled mains and lightened rods
    • Available as a billet or a forging
  • Ultra Dirt - LS - Billet 
    Stroke Main Pin Cammed for rod length Part #
    3.625 2.559 1.888 6.125 APH-39@-UD
    3.900 2.559 2.000 6.125 APC-34@-UD
    4.000 2.559 2.000 6.125 APO-34@-UD
    4.100 2.559 2.000 6.125 AP&-34@-UD
    **Also available in a forging ** Only a partial listing of the available part numbers is listed here. Contact our sales team for a full list. 419-435-2711 /p>
  • « Back to Catalog
  • LS - Ultra UD - Billet-image
  • LS - Ultra UD - Billet

  • 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 Dirt - LS - Billet

    Standard Features

    • Stroke range from 2.720” to 4.250”
    • Fully Counterweighted
    • Counterweight prepped for 1850g bob weight
    • Gun drilled mains and lightened rods
    • Available as a billet or a forging
  • Ultra Dirt - LS - Billet 
    Stroke Main Pin Cammed for rod length Part #
    3.625 2.559 1.888 6.125 APH-39@-UD
    3.900 2.559 2.000 6.125 APC-34@-UD
    4.000 2.559 2.000 6.125 APO-34@-UD
    4.100 2.559 2.000 6.125 AP&-34@-UD
    **Also available in a forging ** Only a partial listing of the available part numbers is listed here. Contact our sales team for a full list. 419-435-2711 /p>

Sales: 419.435.2711

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