{"product_id":"5348546-cummins-isl-g-natural-gas-cylinder-head-new-loaded","title":"5348546 Cummins ISL G 8.9L Natural Gas Loaded Cylinder Head – New","description":"\u003cp\u003eNew, fully loaded cylinder head for the \u003cstrong\u003eCummins ISL G 8.9L natural gas\u003c\/strong\u003e engine, built to replace Cummins \u003cstrong\u003e5348546 and 5569421\u003c\/strong\u003e. Common in transit buses and refuse trucks running CNG or LNG. It arrives assembled and ready to bolt on, with no core to send back.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eNew cylinder head casting\u003c\/li\u003e\n\u003cli\u003eNew intake and exhaust valves (Stage 1 — natural-gas valve package)\u003c\/li\u003e\n\u003cli\u003eNew valve springs, retainers and keepers\u003c\/li\u003e\n\u003cli\u003eValve guides and valve stem seals installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included:\u003c\/strong\u003e head gasket set, head bolts, injectors, rocker assemblies. Ask us and we will quote the matching gasket set and bolt kit.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplaces\u003c\/td\u003e\n\u003ctd\u003eCummins 5348546, 5569421 and cross-references below\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine\u003c\/td\u003e\n\u003ctd\u003eCummins ISL G \/ ISL9 G 8.9L spark-ignited natural gas\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eNew — no core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly\u003c\/td\u003e\n\u003ctd\u003eLoaded (valves, springs, retainers, keepers, guides, seals)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve package\u003c\/td\u003e\n\u003ctd\u003eStage 1 — natural-gas application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eJAK's Diesel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits Cummins ISL G and ISL9 G spark-ignited natural gas engines (CNG \/ LNG). This head has spark-plug bores and is \u003cstrong\u003enot\u003c\/strong\u003e for the diesel ISL. We confirm fitment by engine serial number (ESN) or casting number before every head ships.\u003c\/p\u003e\n\n\u003ch2\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eOEM and reman numbers:\u003c\/strong\u003e 5348546, 5348546RX, 5569421, 5569421RX, 4933817, 4933818, 4933819, 4933820, 4933820NX, 4933820RX, 4933830NX\u003c\/p\u003e\n\n\u003ch2\u003eShipping, Core \u0026amp; Warranty\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo core charge, no core return.\u003c\/strong\u003e This is a new casting, not an exchange unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreight:\u003c\/strong\u003e ships crated by LTL freight. Freight is free to a commercial address with a forklift or dock. Residential, liftgate and terminal delivery can be quoted — call before you order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocal pickup:\u003c\/strong\u003e available in Henderson, CO by arrangement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 year against defects in materials and workmanship.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs this head new or remanufactured?\u003c\/h3\u003e\n\u003cp\u003eNew. It is a new casting assembled with new valvetrain components — not a rebuilt core.\u003c\/p\u003e\n\u003ch3\u003eDo I have to send back a core?\u003c\/h3\u003e\n\u003cp\u003eNo. There is no core charge and nothing to return.\u003c\/p\u003e\n\u003ch3\u003eWhat else do I need to install it?\u003c\/h3\u003e\n\u003cp\u003ePlan on a new head gasket set and head bolts for the ISL G. They are not included. Message us and we will match the right kit to your engine serial number.\u003c\/p\u003e\n\u003ch3\u003eHow do I confirm it fits my ISL G?\u003c\/h3\u003e\n\u003cp\u003eSend us your engine serial number (ESN) or the casting number from your old head. We verify fitment against 5348546 before the head ships.\u003c\/p\u003e\n\u003ch3\u003eWill this fit a diesel ISL?\u003c\/h3\u003e\n\u003cp\u003eNo. The ISL G head is built for spark-ignited natural gas engines and has spark-plug bores. Diesel ISL engines use a different head.\u003c\/p\u003e\n\u003ch3\u003eHow long does delivery take?\u003c\/h3\u003e\n\u003cp\u003eHeads are crated and handed to the LTL carrier in 1–2 business days. Transit is typically 2–5 business days depending on your location.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is this head new or remanufactured?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"New. It is a new casting assembled with new valvetrain components - not a rebuilt core.\"}}, {\"@type\": \"Question\", \"name\": \"Do I have to send back a core?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. There is no core charge and nothing to return.\"}}, {\"@type\": \"Question\", \"name\": \"What else do I need to install it?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Plan on a new head gasket set and head bolts for the ISL G. They are not included. Message us and we will match the right kit to your engine serial number.\"}}, {\"@type\": \"Question\", \"name\": \"How do I confirm it fits my ISL G?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Send us your engine serial number (ESN) or the casting number from your old head. We verify fitment against 5348546 before the head ships.\"}}, {\"@type\": \"Question\", \"name\": \"Will this fit a diesel ISL?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. The ISL G head is built for spark-ignited natural gas engines and has spark-plug bores. Diesel ISL engines use a different head.\"}}, {\"@type\": \"Question\", \"name\": \"How long does delivery take?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Heads are crated and handed to the LTL carrier in 1-2 business days. Transit is typically 2-5 business days depending on your location.\"}}]}\u003c\/script\u003e\n\u003cp\u003eQuestions? Call JAK's Diesel at \u003ca href=\"tel:+17204456249\"\u003e(720) 445-6249\u003c\/a\u003e. See all \u003ca href=\"\/collections\/cummins-isc-isl-parts\"\u003eCummins ISC \u0026amp; ISL parts\u003c\/a\u003e or \u003ca href=\"\/collections\/cylinder-heads\"\u003ediesel cylinder heads\u003c\/a\u003e.\u003c\/p\u003e","brand":"JAK's Diesel","offers":[{"title":"Default Title","offer_id":67863855268025,"sku":"JAKS-5348546","price":2399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/6171\/4361\/files\/5348546-1.jpg?v=1792688494","url":"https:\/\/www.jaksdiesel.com\/products\/5348546-cummins-isl-g-natural-gas-cylinder-head-new-loaded","provider":"JAK's Diesel","version":"1.0","type":"link"}