{"product_id":"ignition-coil-and-iridium-spark-plugs-for-chevrolet-ssr-2003-2004-5-3l","title":"Ignition Coil and Iridium Spark Plugs for Chevrolet SSR (2003-2004) 5.3L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2003-2004 Chevrolet SSR\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The complete ignition kit replaces degraded factory coil packs and worn spark plugs on the 2003-2004 SSR to eliminate cylinder misfires, stabilize secondary ignition voltage, and restore crisp throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet SSR Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eFactory ignition coils on the \u003cstrong\u003eGMT368\u003c\/strong\u003e platform face sustained thermal stress within a tightly packaged engine bay. Over operational life cycles, the original coil winding insulation and epoxy potting deteriorate under high cylinder head temperatures, causing internal resistance breakdown and high-voltage arc leakage. Paired with aged spark plugs suffering from widened, eroded ground gaps, the stock ignition system regularly manifests high-load misfires (DTC P0300), sluggish off-idle acceleration, and unburnt hydrocarbon fouling.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete tune-up kit restores primary and secondary ignition circuit integrity. The eight square-body coil packs are constructed with high-dielectric epoxy potting and high-conductivity copper windings designed to resist internal thermal fatigue and deliver a sustained 35kV+ output. Paired with fine-wire iridium-electrode spark plugs, this kit lowers ionizing voltage requirements, resists carbon fouling, and creates an efficient flame front for optimal combustion in the all-aluminum \u003cstrong\u003eLM4\u003c\/strong\u003e block.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2003-2004 Chevrolet SSR\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e5.3L Vortec V8 (\u003cstrong\u003eLM4\u003c\/strong\u003e) \/ \u003cstrong\u003eGMT368\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e300 hp \/ 331 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003e12611424\u003c\/strong\u003e, \u003cstrong\u003e12570616\u003c\/strong\u003e, \u003cstrong\u003eD510C\u003c\/strong\u003e, \u003cstrong\u003eUF413\u003c\/strong\u003e, \u003cstrong\u003eC1511\u003c\/strong\u003e, \u003cstrong\u003eD513A\u003c\/strong\u003e, \u003cstrong\u003eD510\u003c\/strong\u003e, \u003cstrong\u003eC511\u003c\/strong\u003e, \u003cstrong\u003eGN10165\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2003 Chevrolet SSR Base 5.3L V8 (Engine Code: LM4)\u003c\/li\u003e\n  \u003cli\u003e2004 Chevrolet SSR Base 5.3L V8 (Engine Code: LM4)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the GMT368 SSR?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2003-2004 Chevrolet SSR equipped with the \u003cstrong\u003eLM4\u003c\/strong\u003e 5.3L engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these iridium spark plugs require manual gapping before installation?\u003c\/strong\u003e\u003cbr\u003e No, these iridium spark plugs come factory pre-gapped for the 5.3L V8; touching or forcing feeler gauges against the fine-wire iridium electrode can damage the tip.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Muscle Caliber\u003c\/h3\u003e\n\u003cp\u003eBuilt for the unique power profile of Chevrolet's retro-styled muscle truck, this direct replacement set ensures consistent ignition timing and high-rpm spark stability. It eliminates spark blowout under wide-open throttle, keeping your small-block V8 running smooth and responsive.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50606564999416,"sku":"DS-EX7D1I0Q7","price":131.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-chevrolet-ssr-2003-2004-5-3l-1.jpg?v=1790090574","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-chevrolet-ssr-2003-2004-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}