{"product_id":"motorcraft-spark-plug-sp521x-agsf22f1x","title":"Motorcraft Spark Plug SP521X (AGSF22F1X)","description":"\u003ch2 data-section-id=\"rmw5tv\" data-start=\"128\" data-end=\"142\"\u003eDescription\u003c\/h2\u003e\n\u003cp data-start=\"143\" data-end=\"494\"\u003eThe \u003cstrong data-start=\"147\" data-end=\"191\"\u003eMotorcraft Spark Plug SP521X (AGSF22F1X)\u003c\/strong\u003e is an OEM-quality replacement spark plug designed to meet strict Ford engineering standards for performance, durability, and reliability. Engineered specifically for \u003cstrong data-start=\"358\" data-end=\"395\"\u003e5.4L V8 and 6.8L V10 Ford engines\u003c\/strong\u003e, this spark plug helps maintain optimal combustion efficiency and consistent ignition performance.\u003c\/p\u003e\n\u003cp data-start=\"496\" data-end=\"784\"\u003eWith a \u003cstrong data-start=\"503\" data-end=\"523\"\u003e.054 pre-set gap\u003c\/strong\u003e and advanced design, the SP521X supports smooth engine operation, reduces misfires, improves fuel efficiency, and helps meet emissions standards. It is also \u003cstrong data-start=\"681\" data-end=\"712\"\u003einterchangeable with SP-521\u003c\/strong\u003e, making it a flexible replacement option for various Ford applications.\u003c\/p\u003e\n\u003cp data-start=\"786\" data-end=\"1011\"\u003eBuilt with high-quality materials, Motorcraft spark plugs are designed to deliver dependable performance over a typical service life of \u003cstrong data-start=\"922\" data-end=\"949\"\u003e60,000 to 100,000 miles\u003c\/strong\u003e, making them ideal for both commercial and personal vehicles.\u003c\/p\u003e\n\u003chr data-start=\"1013\" data-end=\"1016\"\u003e\n\u003ch2 data-section-id=\"1d7mrtu\" data-start=\"1018\" data-end=\"1029\"\u003eFeatures\u003c\/h2\u003e\n\u003cul data-start=\"1030\" data-end=\"1473\"\u003e\n\u003cli data-section-id=\"1ks3r0v\" data-start=\"1030\" data-end=\"1065\"\u003eGenuine \u003cstrong data-start=\"1040\" data-end=\"1065\"\u003eMotorcraft spark plug\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"q3klbs\" data-start=\"1066\" data-end=\"1103\"\u003ePart Number: \u003cstrong data-start=\"1081\" data-end=\"1103\"\u003eSP521X \/ AGSF22F1X\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1ugigxr\" data-start=\"1104\" data-end=\"1156\"\u003eDesigned for \u003cstrong data-start=\"1119\" data-end=\"1156\"\u003eFord 5.4L V8 and 6.8L V10 engines\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"qo5c9b\" data-start=\"1157\" data-end=\"1181\"\u003e\u003cstrong data-start=\"1159\" data-end=\"1181\"\u003ePre-gapped at .054\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"ooxr6x\" data-start=\"1182\" data-end=\"1239\"\u003eHelps reduce misfires and improve combustion efficiency\u003c\/li\u003e\n\u003cli data-section-id=\"j7q1mm\" data-start=\"1240\" data-end=\"1288\"\u003eSupports fuel economy and emissions compliance\u003c\/li\u003e\n\u003cli data-section-id=\"1mwyjcb\" data-start=\"1289\" data-end=\"1331\"\u003eMeets \u003cstrong data-start=\"1297\" data-end=\"1331\"\u003eFord OEM engineering standards\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1vj29yy\" data-start=\"1332\" data-end=\"1365\"\u003eInterchangeable with \u003cstrong data-start=\"1355\" data-end=\"1365\"\u003eSP-521\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"hyd5og\" data-start=\"1366\" data-end=\"1415\"\u003eLong service interval: \u003cstrong data-start=\"1391\" data-end=\"1415\"\u003e60,000–100,000 miles\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1u5br72\" data-start=\"1416\" data-end=\"1473\"\u003eDurable construction for reliable long-term performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1475\" data-end=\"1478\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"1480\" data-end=\"1507\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul data-start=\"1508\" data-end=\"1623\"\u003e\n\u003cli data-section-id=\"9t8w0w\" data-start=\"1508\" data-end=\"1533\"\u003e\n\u003cstrong data-start=\"1510\" data-end=\"1520\"\u003eBrand:\u003c\/strong\u003e Motorcraft\u003c\/li\u003e\n\u003cli data-section-id=\"10xylbv\" data-start=\"1534\" data-end=\"1551\"\u003e\n\u003cstrong data-start=\"1536\" data-end=\"1544\"\u003eGap:\u003c\/strong\u003e .054\u003c\/li\u003e\n\u003cli data-section-id=\"1qzghgz\" data-start=\"1552\" data-end=\"1599\"\u003e\n\u003cstrong data-start=\"1554\" data-end=\"1569\"\u003eDimensions:\u003c\/strong\u003e 1.00 L x 1.00 W x 3.38 H in\u003c\/li\u003e\n\u003cli data-section-id=\"1ilbiar\" data-start=\"1600\" data-end=\"1623\"\u003e\n\u003cstrong data-start=\"1602\" data-end=\"1613\"\u003eWeight:\u003c\/strong\u003e 0.10 lb\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1625\" data-end=\"1628\"\u003e\n\u003ch2 data-section-id=\"1dixaz0\" data-start=\"1630\" data-end=\"1640\"\u003eFitment\u003c\/h2\u003e\n\u003ch3 data-section-id=\"ynacxl\" data-start=\"1642\" data-end=\"1650\"\u003eFord\u003c\/h3\u003e\n\u003cul data-start=\"1651\" data-end=\"1834\"\u003e\n\u003cli data-section-id=\"1o03trj\" data-start=\"1651\" data-end=\"1685\"\u003e\n\u003cstrong data-start=\"1653\" data-end=\"1663\"\u003eE-150:\u003c\/strong\u003e 2009–2014 – V8 5.4L\u003c\/li\u003e\n\u003cli data-section-id=\"ieunm4\" data-start=\"1686\" data-end=\"1720\"\u003e\n\u003cstrong data-start=\"1688\" data-end=\"1698\"\u003eE-250:\u003c\/strong\u003e 2009–2014 – V8 5.4L\u003c\/li\u003e\n\u003cli data-section-id=\"1mj4jah\" data-start=\"1721\" data-end=\"1777\"\u003e\n\u003cstrong data-start=\"1723\" data-end=\"1744\"\u003eE-350 Super Duty:\u003c\/strong\u003e 2009–2019 – V8 5.4L \/ V10 6.8L\u003c\/li\u003e\n\u003cli data-section-id=\"1rcnnny\" data-start=\"1778\" data-end=\"1834\"\u003e\n\u003cstrong data-start=\"1780\" data-end=\"1801\"\u003eE-450 Super Duty:\u003c\/strong\u003e 2009–2019 – V8 5.4L \/ V10 6.8L\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MOTORCRAFT","offers":[{"title":"Default Title","offer_id":46434878456007,"sku":"ELE2113","price":7.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/2277\/5751\/files\/Screenshot2026-04-21110020.png?v=1776794431","url":"https:\/\/mainstreeteshop.com\/products\/motorcraft-spark-plug-sp521x-agsf22f1x","provider":"MAIN STREET ESHOP","version":"1.0","type":"link"}