Modular Motor 4V / 3V Billet Crank Sprocket


SKU: MM-SP-4V Categories: , , Tag:


Billet Crank Sprockets from Boundary follows the same heritage as our oil pump gears, manufactured 100% in-house with US-sourced materials. These sprockets start with a Chromoly steel that is ten times stronger than the OEM powdered metal, hot quenched with a low temper for the highest strength and resistance to wear.

  • All sprockets heat treated to maximum hardness while maintaining toughness
  • Precision CNC machined and broached for snug, accurate fit
  • Dimensions are checked after machining and after heat treatment for a guaranteed fit.
  • High finish reduces friction and chain vibration
  • New tooth geometry strengthens teeth and keyway


MM-SP-4V  Single keyway is the factory standard (without integrated spacer)

MM-SP-4V-K Multi-keyway allows cam centerline adjustment up to 4 degrees in either direction (without integrated spacer)

MM-SP-4V-S Ford OEM with integrated spacer

Additional information

Weight 0.7 lbs
Dimensions 3 × 3 × 3 in