Description
SIERRA GM V6 Thunderbolt IV/V HEI Distributor Cap – 18-5396
The SIERRA 18-5396 is a replacement distributor cap for compatible GM V6 marine engines using MerCruiser Thunderbolt IV or Thunderbolt V HEI-style ignition.
- Designed for GM V6 Thunderbolt IV and Thunderbolt V marine ignition systems
- HEI-style cap configuration matches the specified MerCruiser distributor system
- Pairs with SIERRA 18-5432 rotor and trigger-wheel assembly
- Provides the high-voltage distribution path for six-cylinder ignition service
- Direct service replacement for selected MerCruiser and aftermarket Thunderbolt distributor-cap references
Specifications
- Ignition System: Thunderbolt IV / Thunderbolt V
- Engine Configuration: GM V6
- Matching Rotor/Trigger Wheel: SIERRA 18-5432


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