
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:
- 18-5470: Thunderbolt HEI Distributor (GM V8)
The Sierra 18-5470 Thunderbolt HEI Distributor (GM V8)
Replaces:
Mercruiser Stern Drive
- 805185A36
- 805185A26
- 805185A16
- 805185A6
- 805185A43
- 90747A27
- 90747A25
- 90747A21
- 90747A3
- 862057A4












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