Thunderbolt HEI Distributor. Battery Powered (HEI) High Energy Ignition. Uses a Hall-Effect type sensor to trigger ignition accurately even at extremely low RPM. Designed as a direct replacement for Mercury Thunderbolt IV Ignition Distributors. Meets or Exceeds SAE J1171 Standards. Fits: GM V-8 Engines w/Thunderbolt IV & V Ignition.
- Battery Powered (HEI) High Energy Ignition
- Uses a Hall-Effect type sensor to trigger ignition accurately even at extremely low RPM
- Designed as a direct replacement for Mercury Thunderbolt IV Ignition Distributors
- Meets or Exceeds SAE J1171 Standards
