{"product_id":"autolite-685-copper-spark-plug","title":"Autolite 685 Copper Spark Plug","description":"\u003ch3 data-section-id=\"hxsibk\" data-start=\"85\" data-end=\"102\"\u003eDescription\u003c\/h3\u003e\n\u003cp data-start=\"103\" data-end=\"417\"\u003eThe Autolite 685 Copper Spark Plug is built to deliver dependable ignition performance, quick starts, and consistent power for a wide range of classic and older vehicle applications. Featuring a copper core center electrode, it provides excellent heat transfer and helps reduce fouling for smooth engine operation.\u003c\/p\u003e\n\u003cp data-start=\"419\" data-end=\"707\"\u003eConstructed with a corrosion-resistant nickel-plated shell and high nickel alloy electrodes, this spark plug offers durability and long service life. The high alumina ceramic insulator enhances thermal conductivity and strength, making it a reliable choice for standard replacement needs.\u003c\/p\u003e\n\u003chr data-start=\"709\" data-end=\"712\"\u003e\n\u003ch3 data-section-id=\"q4c1cr\" data-start=\"714\" data-end=\"727\"\u003eFeatures:\u003c\/h3\u003e\n\u003cul data-start=\"728\" data-end=\"1174\"\u003e\n\u003cli data-section-id=\"dt65jc\" data-start=\"728\" data-end=\"813\"\u003eCopper core center electrode for improved heat dissipation and fouling resistance\u003c\/li\u003e\n\u003cli data-section-id=\"uixeew\" data-start=\"814\" data-end=\"886\"\u003eNickel-plated shell for corrosion resistance and extended durability\u003c\/li\u003e\n\u003cli data-section-id=\"187vpxa\" data-start=\"887\" data-end=\"943\"\u003eHigh nickel alloy electrodes for longer service life\u003c\/li\u003e\n\u003cli data-section-id=\"14khihx\" data-start=\"944\" data-end=\"1014\"\u003eHigh alumina ceramic insulator for strength and optimal insulation\u003c\/li\u003e\n\u003cli data-section-id=\"7ffdeo\" data-start=\"1015\" data-end=\"1074\"\u003eProvides quick starts and reliable ignition performance\u003c\/li\u003e\n\u003cli data-section-id=\"15xcg1h\" data-start=\"1075\" data-end=\"1134\"\u003eIdeal for classic and standard replacement applications\u003c\/li\u003e\n\u003cli data-section-id=\"kxr808\" data-start=\"1135\" data-end=\"1174\"\u003eBacked by a 2-year limited warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1176\" data-end=\"1179\"\u003e\n\u003ch3 data-section-id=\"1ke4z4i\" data-start=\"1181\" data-end=\"1200\"\u003eSpecifications:\u003c\/h3\u003e\n\u003cul data-start=\"1201\" data-end=\"1651\"\u003e\n\u003cli data-section-id=\"t1nkhe\" data-start=\"1201\" data-end=\"1220\"\u003eBrand: Autolite\u003c\/li\u003e\n\u003cli data-section-id=\"jhof4t\" data-start=\"1221\" data-end=\"1241\"\u003ePart Number: 685\u003c\/li\u003e\n\u003cli data-section-id=\"1r4n8m3\" data-start=\"1242\" data-end=\"1272\"\u003eResistor: Yes (5,000 Ohms)\u003c\/li\u003e\n\u003cli data-section-id=\"qaigu4\" data-start=\"1273\" data-end=\"1323\"\u003eElectrode Material: Nickel (center and ground)\u003c\/li\u003e\n\u003cli data-section-id=\"v0tj1a\" data-start=\"1324\" data-end=\"1357\"\u003eCenter Electrode Core: Copper\u003c\/li\u003e\n\u003cli data-section-id=\"1d457ld\" data-start=\"1358\" data-end=\"1385\"\u003eThread Size: M14 x 1.25\u003c\/li\u003e\n\u003cli data-section-id=\"132rwse\" data-start=\"1386\" data-end=\"1412\"\u003eThread Diameter: 14 mm\u003c\/li\u003e\n\u003cli data-section-id=\"1qbe7z6\" data-start=\"1413\" data-end=\"1431\"\u003eHex Size: 5\/8\"\u003c\/li\u003e\n\u003cli data-section-id=\"1sl50u2\" data-start=\"1432\" data-end=\"1454\"\u003eSeat Type: Tapered\u003c\/li\u003e\n\u003cli data-section-id=\"cvvox0\" data-start=\"1455\" data-end=\"1474\"\u003ePre-Gap: 1.5 mm\u003c\/li\u003e\n\u003cli data-section-id=\"rrhcr1\" data-start=\"1475\" data-end=\"1492\"\u003eHeat Range: 8\u003c\/li\u003e\n\u003cli data-section-id=\"1tcgx5m\" data-start=\"1493\" data-end=\"1525\"\u003eGround Electrode Quantity: 1\u003c\/li\u003e\n\u003cli data-section-id=\"b10wp6\" data-start=\"1526\" data-end=\"1562\"\u003eTerminal Type: Non-removable nut\u003c\/li\u003e\n\u003cli data-section-id=\"1odzs0e\" data-start=\"1563\" data-end=\"1594\"\u003eInsulator Material: Ceramic\u003c\/li\u003e\n\u003cli data-section-id=\"a0qjy1\" data-start=\"1595\" data-end=\"1651\"\u003eCenter Electrode Design: Standard (short projection)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1653\" data-end=\"1656\"\u003e\n\u003ch3 data-section-id=\"ysdoie\" data-start=\"1658\" data-end=\"1681\"\u003eFitment Highlights:\u003c\/h3\u003e\n\u003cp data-start=\"1682\" data-end=\"1757\"\u003eCompatible with a wide range of classic GM and related vehicles, including:\u003c\/p\u003e\n\u003cul data-start=\"1759\" data-end=\"2027\"\u003e\n\u003cli data-section-id=\"1ef7ytu\" data-start=\"1759\" data-end=\"1871\"\u003eChevrolet models such as Bel Air, Camaro, Caprice, Chevelle, Corvette, Impala, Monte Carlo, Nova (mid-1970s)\u003c\/li\u003e\n\u003cli data-section-id=\"1ifp0qf\" data-start=\"1872\" data-end=\"1948\"\u003eChevrolet\/GMC trucks and vans (C\/K Series, Suburban, G-Series, P-Series)\u003c\/li\u003e\n\u003cli data-section-id=\"1q80dqj\" data-start=\"1949\" data-end=\"1999\"\u003eGMC trucks and SUVs including Jimmy and Sprint\u003c\/li\u003e\n\u003cli data-section-id=\"1ff85e8\" data-start=\"2000\" data-end=\"2027\"\u003eChecker Marathon (1975)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2029\" data-end=\"2162\"\u003e\u003cem data-start=\"2029\" data-end=\"2162\"\u003e(Primarily fits vehicles with L6 4.8L and V8 5.7L, 6.6L, and 7.4L engines from the mid-to-late 1970s. Always verify exact fitment.)\u003c\/em\u003e\u003c\/p\u003e","brand":"AUTOLITE","offers":[{"title":"Default Title","offer_id":46445586317511,"sku":"ELE1569","price":3.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/2277\/5751\/files\/Screenshot2026-04-23135420_c859b2b9-a935-4353-bb9d-d3636f1dcc3e.png?v=1776978880","url":"https:\/\/mainstreeteshop.com\/products\/autolite-685-copper-spark-plug","provider":"MAIN STREET ESHOP","version":"1.0","type":"link"}