Mercury Marine 700 SCi 7 inch Harmonic Balancer - External Balance

Mercury Marine 500 EFI / 525 EFI Harmonic Balancer - External Balance

Part# 4003
Only $625.00
Externally Balanced Harmonic Balancer for Mercury Mercruiser Engines with SFI 18.1 Rating for the highest quality. The Balancer features an all aluminum anodized case design for light weight, stress-proof steel hub and 1040 steel inertia rings for durability. Wet clutch friction design style with precision machined harmonic dampening for street and race engines.


  • Dual Keyway Option - Add $20.00
    Add dual keyways for Supercharged or Extreme Duty Applications. Requires double keyed crankshaft snout.


  • Outer Diameter: 7"
  • Weight: 9.7 lbs
  • Anodized for corrosion protection in fresh water and salt water applications.
  • For External Balance Applications Only
  • Exceeds SFI 18.1 standards and is marked on front with SFI Sticker, and on the rear with SFI number stamped into unit.