{"product_id":"arco-dr004-mercruiser-rotor-57-dr004","title":"Arco DR004 Distributor Rotor — MerCruiser Thunderbolt V8 5.0 \/ 5.7 \/ 7.4L","description":"\u003ch2\u003eOEM-Grade Distributor Rotor for MerCruiser Thunderbolt V8 Engines\u003c\/h2\u003e\u003cp\u003eThe Arco DR004 is a precision-fit replacement distributor rotor built for MerCruiser GM V8 engines equipped with the Thunderbolt Electronic Ignition system. Covering 5.0L, 5.7L, and 7.4L displacements, this rotor restores reliable spark distribution and is a staple component in any Thunderbolt ignition tune-up.\u003c\/p\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser GM V8 5.0L — Thunderbolt Electronic Ignition\u003c\/li\u003e\n\u003cli\u003eMerCruiser GM V8 5.7L — Thunderbolt Electronic Ignition\u003c\/li\u003e\n\u003cli\u003eMerCruiser GM V8 7.4L — Thunderbolt Electronic Ignition\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces OEM Part Numbers\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser: 13524A1, 13524A3, 13524A5, 13524T1, 19405A3, 90576A2\u003c\/li\u003e\n\u003cli\u003eSierra: 18-5431\u003c\/li\u003e\n\u003cli\u003eCDI Electronics: E65-0009\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe DR004 is the correct rotor for MerCruiser Thunderbolt ignition systems — one of the most widely used ignition setups on V8 inboard boats from the 1980s through the mid-2000s. It’s a go-to tune-up component when diagnosing rough idle, hard starting, or ignition misfires on 5.7L and 7.4L engines. Always replace the rotor and distributor cap as a set. Pair with the \u003ca href=\"\/products\/arco-dc004-mercruiser-volvo-distributor-cap\"\u003eArco DC004 Distributor Cap\u003c\/a\u003e or \u003ca href=\"\/products\/arco-dc007-mercruiser-distributor-cap\"\u003eArco DC007 Distributor Cap\u003c\/a\u003e depending on your specific engine configuration for a complete ignition service.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250812223524,"sku":"57-DR004","price":37.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/57-DR004.jpg?v=1786510582","url":"https:\/\/marisolmarine.com\/products\/arco-dr004-mercruiser-rotor-57-dr004","provider":"Marisol Marine Company","version":"1.0","type":"link"}