{"product_id":"quicksilver-distributor-cap-kit-for-gm-v8-thunderbolt-iv-v-hei-cap-rotor-gasket-rfi-resistant","title":"Quicksilver Distributor Cap Kit for GM V8 Thunderbolt IV\/V HEI — Cap, Rotor \u0026 Gasket, RFI-resistant","description":"\u003cp\u003e\u003cstrong\u003eQuicksilver 805759Q3 is a complete distributor cap kit—cap, rotor and gasket—built to replace worn ignition parts on GM V8 MerCruiser engines using Thunderbolt IV and V HEI systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis kit gives you the essential ignition components engineered to match Mercury Marine specifications for reliable onboard performance. The cap is molded from a PBT\/PET plastic blend for enhanced stiffness and thermal resistance, and it includes solid brass inserts that guard against corrosion and electrical wear. Together with the rotor and gasket, this assembly helps maintain proper spark distribution while minimizing radio-frequency interference with modern marine electronics.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this distributor cap kit fit MerCruiser Thunderbolt IV and V HEI systems?\u003c\/h3\u003e\n\u003cp\u003eThe kit is made to align with the dimensions and electrical layout of GM V8 MerCruiser engines using Thunderbolt IV and V high-energy ignition setups. It replaces the cap, rotor, and sealing gasket in one service operation so you restore original-fit function without sourcing multiple parts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for compatible Thunderbolt IV and V HEI distributors\u003c\/li\u003e\n  \u003cli\u003eIncludes cap, rotor, and gasket for one-stop servicing\u003c\/li\u003e\n  \u003cli\u003eManufactured to Mercury Marine OEM-equivalent standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and design features improve durability and performance?\u003c\/h3\u003e\n\u003cp\u003eThe cap is produced from a blend of PBT and PET plastics that increases strength and resists warpage, while a high strength-to-weight ratio reduces thermal cracking risk. Internal solid brass inserts deliver improved conductivity and corrosion resistance compared with plated or stamped terminals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePBT\/PET housing for stiffness and heat resistance\u003c\/li\u003e\n  \u003cli\u003eSolid brass terminal inserts reduce pitting and electrical losses\u003c\/li\u003e\n  \u003cli\u003eGasket included to preserve distributor sealing and prevent moisture intrusion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this kit affect onboard electronics or cause interference?\u003c\/h3\u003e\n\u003cp\u003eThe cap’s design includes RFI-resistant construction to limit radio-frequency interference with navigation and communication systems. That reduces the chance of ignition noise affecting sensitive electronics while you run the engine.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRFI-resistant materials and layout to minimize electromagnetic noise\u003c\/li\u003e\n  \u003cli\u003eHelps maintain clear signals for onboard navigation and audio gear\u003c\/li\u003e\n  \u003cli\u003eUseful for boats with modern electronic instruments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat maintenance or installation tips should I know?\u003c\/h3\u003e\n\u003cp\u003eReplace the cap, rotor, and gasket together to ensure consistent contact, correct timing signal, and a proper seal. Inspect the distributor shaft and mounting points for wear before assembly, and follow torque and alignment specs from your engine manual when reinstalling.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstall all included components in one service to restore OEM fit\u003c\/li\u003e\n  \u003cli\u003eCheck distributor shaft and connectors for wear before fitting\u003c\/li\u003e\n  \u003cli\u003eUse manufacturer torque specs and verify spark timing after install\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Boat owners, marine technicians, and DIY mechanics who maintain MerCruiser-powered boats equipped with GM V8 Thunderbolt IV or V HEI ignition systems. If you need an OEM-grade cap replacement with a rotor and sealing gasket that prioritize durability, electrical reliability, and reduced interference, this Quicksilver kit is intended for those servicing Mercury Marine-compatible ignition systems.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this kit compatible with Thunderbolt IV and V HEI distributors?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it’s designed to replace the cap, rotor, and gasket on GM V8 MerCruiser engines using Thunderbolt IV and V HEI systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the cap resist corrosion and RFI interference?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — solid brass inserts resist corrosion and the cap’s design reduces radio-frequency interference with onboard electronics.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Quicksilver","offers":[{"title":"Default Title","offer_id":67586798420153,"sku":"B001HBSXKK","price":128.71,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/quicksilver-distributor-cap-kit-front-packaging.jpg?v=1790493267","url":"https:\/\/redleafauto.ca\/products\/quicksilver-distributor-cap-kit-for-gm-v8-thunderbolt-iv-v-hei-cap-rotor-gasket-rfi-resistant","provider":"Redleaf Auto","version":"1.0","type":"link"}