
Key Features:
- 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
Use With:
- 18-5274: Tune Up Kit
The Sierra 18-5471 Thunderbolt HEI Distributor (GM V6)
Replaces:
Mercruiser Stern Drive
- 805185A37
- 805185A27
- 805185A15
- 805185A5
- 805185A45
- 90747A28
- 90747A26
- 90747A15
- 90747A8











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