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CALLIES

Callies LS Ultra UD 4.000 Stroke CCW Billet Crankshaft

PART NUMBER:
APO-34@-UD
MPN:
APO-34@-UD
Availability:
Ships from Manufacturer
Shipping:
Free Over $98 In U.S. 48
Type:
4.000 Stroke Cranks
Series:
LS Ultra UD
Crankshaft Material:
Billet
Crank Snout Type:
Short (Wet Sump)
Crank Reluctor Wheel:
See Options
Stroke:
4.000"
Main Journal Diameter:
2.559"
Rod Journal Diameter:
2.000"
Minimum Rod Length:
6.125
Bolt Pattern:
6-Bolt
$4,391.00

Description

Callies LS Ultra UD 4.000 Stroke CCW Billet Crankshaft

Wet Sump Post, 4.000" Stroke, 2.000" Rod Journals, 24x or 58x Reluctor Wheel

Features:

  • Fully counterweighted Billet
  • Gun Drilled Mains
  • All Rod Journals Lightened

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.

 

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