{"product_id":"drag-specialties-spark-plugs-for-1948-1974-big-twin-e18-6664sds","title":"Drag Specialties Spark Plugs for 1948-1974 Big Twin, E18-6664SDS","description":"Spark Plugs - '48-'74 Big Twin\n\u003cp\u003eUpgrade the ignition system of your 1948-1974 Big Twin motorcycle with Drag Specialties Spark Plugs, manufacturer part number E18-6664SDS and vendor part number E18-6664SDS. Designed for compatible Big Twin applications, these spark plugs combine dependable construction with materials selected for heat resistance, electrical insulation, and long service life.\u003c\/p\u003e\u003cp\u003eThe black ceramic body with bold red Drag Specialties branding provides a distinctive appearance, while the insulator is manufactured from 95% pure alumina for strong resistance to heat shock and reliable insulation. The multi-rib insulator design helps reduce the possibility of flashover, supporting consistent ignition performance under demanding operating conditions.\u003c\/p\u003e\u003cp\u003eEach E18-6664SDS spark plug features a nickel-plated housing to help resist oxidation and corrosion. Multilayer gaskets and a heat-crimping manufacturing process provide a leak-free, gas-tight fit. The copper core electrode delivers effective electrical and heat conductivity while helping prevent oxidation and corrosion, contributing to dependable spark delivery and extended service life.\u003c\/p\u003e\u003cp\u003eThese Drag Specialties spark plugs are intended for fitment on select 1948-1974 Big Twin motorcycles. Verify the motorcycle model, engine application, and original-equipment specifications before installation to ensure proper compatibility.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFitment: Designed for select 1948-1974 Big Twin motorcycle applications\u003c\/li\u003e\n\u003cli\u003eBrand: Drag Specialties\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: E18-6664SDS\u003c\/li\u003e\n\u003cli\u003eVendor Part Number: E18-6664SDS\u003c\/li\u003e\n\u003cli\u003eInsulator: 95% pure alumina construction resists heat shock and provides strong electrical insulation\u003c\/li\u003e\n\u003cli\u003eInsulator Design: Multi-rib profile helps reduce flashover\u003c\/li\u003e\n\u003cli\u003eHousing: Nickel-plated finish helps protect against oxidation and corrosion\u003c\/li\u003e\n\u003cli\u003eSealing: Multilayer gaskets and heat-crimping process provide a leak-free, gas-tight fit\u003c\/li\u003e\n\u003cli\u003eElectrode: Copper core supports electrical and heat conductivity while resisting oxidation and corrosion\u003c\/li\u003e\n\u003cli\u003eAppearance: Black ceramic body with red Drag Specialties logo and script\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DRAG SPECIALTIES","offers":[{"title":"Default Title","offer_id":67569458938091,"sku":"21030207","price":13.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/9150.png?v=1790805967","url":"https:\/\/ctracingservices.com\/products\/drag-specialties-spark-plugs-for-1948-1974-big-twin-e18-6664sds","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}