Sierra 18-5470 marine thunderbolt hei distributor (gm v8). 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. Replaces: Mercruiser Stern Drive 805185A36, 805185A26, 805185A16, 805185A6, 805185A43, 90747A27, 90747A25, 90747A21, 90747A3, 862057A4.

About Sierra
Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.

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