Quicksilver 805759Q3 Distributor Cap Kit - Marinized V-8 Engines by General Motors with Thunderbolt IV and V HEI Ignition Systems

Had a power and misfire issues…change the part with this one and all is working perfect. My engine is a mercruiser 5.7L black scorpion

The 805759Q3 Distributor Cap Kit (and similar OEM‑style distributor cap kits for marinized GM V8 engines) is a solid choice for refreshing your engine’s ignition system. Designed to fit marinized V8 MerCruiser engines from General Motors equipped with Thunderbolt or Delco HEI ignition systems, this kit includes the distributor cap, rotor, and gasket you need to get things running smoothly again. Built to meet original equipment specifications, the durable plastic cap resists warping from heat and vibration, and the brass inserts help fend off corrosion and electrical pitting — important for marine environments where moisture and salt air can wreak havoc on ignition parts. Pros: OEM‑grade fit and materials, corrosion‑resistant construction, restores ignition performance Cons: Requires proper fitment to your specific engine type — check your manual before ordering Bottom Line: A dependable and straightforward way to keep your boat’s V8 running strong. This distributor cap kit gives you renewed spark performance and durable construction that’s up to the challenge of marine us

Works well on my 5.7l Mercruiser

Good quality cap has brass terminals,

I always buy factory parts-can’t go wrong 95% of the time-big issue with this product-bone heads at mercury think it’s funny to put bubble wrap around the rotor-place inside the cap so it will stick & jack up the gasket…-25 years and still Doing it…