{"product_id":"4j-head-bolt-set-4jj1-4jk1-4jj3-fuse-tech","title":"4J Head Bolt Set - 4JJ1 \/ 4JK1 \/ 4JJ3 - Fuse Tech","description":"\u003c!-- ==================== Product: 4J Head Bolt Set - 4JJ1 \/ 4JK1 \/ 4JJ3 | FuseTech ==================== --\u003e\n\u003cstyle\u003e\n.product-description details summary{cursor:pointer;list-style:none;position:relative;padding-left:16px;font-weight:700;margin:10px 0;}\n.product-description details summary::before{content:\"▸\";position:absolute;left:0;color:#00c853;transition:transform .2s;}\n.product-description details[open] summary::before{transform:rotate(90deg);}\n\u003c\/style\u003e\n\u003cdiv class=\"product-description\"\u003e\n\u003ch1 style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cu\u003e🔩 4J Heavy Duty Head Bolt Set (18 pc) - 4JJ1 \/ 4JK1 \/ 4JJ3\u003c\/u\u003e\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2 style=\"text-align: center; margin: 0 0 10px;\"\u003eDirect-Fit Clamping Insurance for Boosted 4J Builds | FuseTech\u003c\/h2\u003e\n\u003c!-- ===== TRUST BADGES ===== --\u003e\n\u003cdiv class=\"crc-badges\"\u003e\n\u003cspan class=\"badge-fusetech\"\u003e⚡ FuseTech Performance\u003c\/span\u003e \u003cspan class=\"badge-red\" style=\"background: #00c853; color: #0d0d0d;\"\u003e✅ Holds the Head Down on Boosted 4Js 🔥\u003c\/span\u003e \u003cspan class=\"badge-blue\"\u003e💳 Afterpay • Humm • Klarna • Zip\u003c\/span\u003e \u003cspan class=\"badge-black\"\u003e🚚 Free Express Shipping AU\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eEvery time the head comes off a 4J, the bolts go in the bin. Put better ones back in.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe factory Isuzu head bolts are torque-to-yield: they stretch to their limit on installation and are strictly single-use. Add boost, fuel and cylinder pressure on a tuned 4JJ1 or 4JJ3 and those factory fasteners are working at the top of their range. This \u003cstrong\u003eFuseTech heavy duty head bolt set\u003c\/strong\u003e is a direct-fit upgrade that threads straight into the factory block: no drilling, no tapping, no machining under the rocker assembly. If you are doing a head gasket, a rebuild, or stepping up the tune, this is the smart set to fit while you are in there.\u003c\/p\u003e\n\u003cp style=\"background: #ffebee; padding: 12px; border-radius: 4px; margin: 16px 0; border-left: 4px solid #c62828;\"\u003e\u003cstrong style=\"color: #c62828;\"\u003e⚠️ INSTALLATION:\u003c\/strong\u003e Professional installation recommended. Always fit a new head gasket, follow the factory tightening sequence, and use the FuseTech-supplied torque specification, not the OEM torque-to-yield procedure.\u003c\/p\u003e\n\u003chr\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\" style=\"background: #00c853; color: #0d0d0d; text-align: left; padding: 10px; font-weight: bold;\"\u003eSpec Snapshot\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f; width: 38%;\"\u003e\u003cstrong\u003eSet contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003e18 x cylinder head bolts (full engine set)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003e\u003cstrong\u003eThread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003eM11 x 1.5 (factory head bolt thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003e\u003cstrong\u003eReplaces OE\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003e8-98201019-0 (supersedes 8-97144583-0 \/ -1 \/ -2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003e\u003cstrong\u003eEngine fitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003e4JJ1-TC \/ 4JJ1-TCX (incl. DPF), 4JK1, 4JX1, 4JJ3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px; border-bottom: 1px solid #1f1f1f;\"\u003eDirect fit into factory block threads, no machining required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #0d0d0d; color: #f5f5f5; padding: 10px;\"\u003eFuseTech Performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003e✅ Key Features\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e🔩 \u003cstrong\u003eFull 18-Bolt Set:\u003c\/strong\u003e Every head bolt for one engine, one box, done\u003c\/li\u003e\n\u003cli\u003e🧩 \u003cstrong\u003eWhole 4J Family:\u003c\/strong\u003e One set covers 4JJ1, 4JK1, 4JX1 and 4JJ3 (all 18 bolts are identical across the platform)\u003c\/li\u003e\n\u003cli\u003e🛠️ \u003cstrong\u003eDirect Fit:\u003c\/strong\u003e Threads into the factory M11 x 1.5 block threads, unlike stud kits which require tapping the block and clearance work under the rockers\u003c\/li\u003e\n\u003cli\u003e🔥 \u003cstrong\u003eBuilt for Boosted Builds:\u003c\/strong\u003e Engineered for tuned engines running elevated cylinder pressure\u003c\/li\u003e\n\u003cli\u003e💡 \u003cstrong\u003eFit While You're In There:\u003c\/strong\u003e Factory bolts must be replaced any time the head is removed, so upgrading costs you zero extra labour\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003e🔧 Vehicle Compatibility\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eIsuzu D-MAX - 4JJ1-TC \/ 4JJ1-TCX (2007-2020, incl. DPF models)\u003c\/li\u003e\n\u003cli\u003eIsuzu D-MAX RG \/ MU-X - 4JJ3 (2020+)\u003c\/li\u003e\n\u003cli\u003eIsuzu MU-X - 4JJ1-TC \/ TCX (2013-2021)\u003c\/li\u003e\n\u003cli\u003eHolden Colorado RC \/ Rodeo RA7 - 4JJ1-TC\u003c\/li\u003e\n\u003cli\u003eMazda BT-50 TF - 4JJ3 (2020+)\u003c\/li\u003e\n\u003cli\u003eIsuzu D-MAX 2.5 - 4JK1 | Jackaroo \/ Trooper - 4JX1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eGood news:\u003c\/strong\u003e Isuzu used the same 18-bolt head fastener design across the whole common rail 4J family, so there is no early\/late split to worry about. Message us with your VIN if unsure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e\n\u003csummary\u003e📦 What's Included\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e18 x FuseTech Heavy Duty Cylinder Head Bolts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: .95em; color: #555; margin-top: 8px;\"\u003e\u003cem\u003eHead gasket not included. Always fit a new head gasket when refitting the cylinder head.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003e🛠️ Installation \u0026amp; Requirements\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional installation recommended\u003c\/strong\u003e for any cylinder head work\u003c\/li\u003e\n\u003cli\u003eClean block threads fully before installation and follow the factory tightening sequence\u003c\/li\u003e\n\u003cli\u003eTorque to the FuseTech-supplied specification (do not use the OEM torque-to-yield angle procedure)\u003c\/li\u003e\n\u003cli\u003ePair with a new head gasket, graded to piston projection per the workshop manual\u003c\/li\u003e\n\u003cli\u003eContact us to confirm stock availability if timing is critical\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e\n\u003csummary\u003e🛡️ Warranty \u0026amp; Returns\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cp\u003eCovered under our standard policy. See our \u003ca href=\"https:\/\/www.commonrailcowboys.com\/policies\/refund-policy\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eRefund, Returns \u0026amp; Warranty Policy\u003c\/a\u003e for full terms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e\n\u003csummary\u003e💳 Payment \u0026amp; Shipping Options\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e💸 \u003cstrong\u003eBuy Now, Pay Later:\u003c\/strong\u003e Afterpay, Humm, Klarna \u0026amp; Zip available\u003c\/li\u003e\n\u003cli\u003e✈️ \u003cstrong\u003eFree Express Shipping Australia-Wide\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e📦 Diesel performance specialists, not general parts resellers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails\u003e\n\u003csummary\u003e❓ Frequently Asked Questions\u003c\/summary\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will these fit my 2012-2019 D-Max 4JJ1?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. This set fits every common rail 4JJ1, from early alloy rocker cover engines through to the DPF-era 4JJ1-TCX, plus the 4JK1, 4JX1 and current 4JJ3.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What OE part number do these replace?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Isuzu 8-98201019-0, which superseded 8-97144583-0, -1 and -2. All are the same bolt design, and a full set is 18 identical bolts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse my factory head bolts instead?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No. Factory bolts are torque-to-yield and single-use only. Isuzu specifies new bolts every time the head is fitted, which makes head work the perfect time to upgrade.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Head bolts or head studs, which should I run?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Studs deliver maximum clamp but the 4JJ1 stud install requires tapping the block threads deeper and clearance work where the outer studs sit under the rocker assembly. These bolts are a straight drop-in, so they suit builds where you want an upgrade over factory without machining.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why upgrade head bolts on a tuned 4JJ1 or 4JJ3?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: More boost and fuel means more cylinder pressure pushing up on the head. Upgraded fasteners help maintain head gasket clamp on hardworking tuned engines, cheap insurance compared to a lifted head.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these head bolts fit a 2012-2019 Isuzu D-Max 4JJ1?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The set fits every common rail 4J engine: 4JJ1-TC and 4JJ1-TCX (including DPF models), 4JK1, 4JX1 and the current 4JJ3 in the 2020-on D-Max, MU-X and Mazda BT-50.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What OE part number do these 4JJ1 head bolts replace?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"They replace Isuzu 8-98201019-0, which superseded 8-97144583-0, 8-97144583-1 and 8-97144583-2. A full engine set is 18 identical bolts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can factory 4JJ1 head bolts be reused?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. The factory head bolts are torque-to-yield and single-use. Isuzu specifies new bolts every time the cylinder head is fitted.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I run head bolts or head studs on a tuned 4JJ1?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Head studs deliver maximum clamping force but require tapping the block threads and clearance work under the rocker assembly on the 4JJ1. Heavy duty head bolts are a direct fit into the factory threads with no machining, suiting builds that want an upgrade over factory fasteners without modification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why upgrade head bolts on a boosted 4JJ1 or 4JJ3?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Increased boost and fuel raises cylinder pressure, which works the factory torque-to-yield bolts harder. Upgraded fasteners help maintain head gasket clamping force on tuned engines.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e \u003c!-- GREEN BANNER CTA - FuseTech Theme --\u003e\n\u003cdiv style=\"background: linear-gradient(135deg, #00c853 0%, #00c853 100%); color: #ffffff; padding: 20px; text-align: center; margin: 20px 0; border-radius: 6px; box-shadow: 0 0 25px rgba(0, 200, 83, 0.6), 0 0 40px rgba(0, 200, 83, 0.4), 0 0 60px rgba(0, 200, 83, 0.2);\"\u003e\n\u003ch2 style=\"margin: 0 0 10px; font-size: 20px; color: #fff; text-shadow: 0 0 10px rgba(0,0,0,0.3);\"\u003e\u003cstrong\u003e⚡ LOCK THAT HEAD DOWN\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp style=\"margin: 0; font-size: 15px; color: #fff; text-shadow: 0 0 5px rgba(0,0,0,0.3);\"\u003e\u003cem\u003eFuseTech heavy duty 18-bolt head set for the full 4J family. Direct fit, no machining. Fit them while the head is off.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 12px; opacity: .8; margin-top: 16px;\"\u003e\u003cstrong\u003eDisclaimer:\u003c\/strong\u003e Common Rail Cowboys is not affiliated with Isuzu Motors, Mazda Motor Corporation, or General Motors Holden. OE part numbers are shown for cross-reference only. Installation should be performed by a qualified technician. Fitment verification and correct torque procedure are the buyer's responsibility.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"FuseTech","offers":[{"title":"Default Title","offer_id":47087343206454,"sku":"4J-FUSETECH-HEAD-BOLT-SET","price":694.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0567\/7868\/6518\/files\/rn-image_picker_lib_temp_e941faa6-b9aa-4543-91da-279500832efe.jpg?v=1785810469","url":"https:\/\/www.commonrailcowboys.com\/en-nz\/products\/4j-head-bolt-set-4jj1-4jk1-4jj3-fuse-tech","provider":"Common Rail Cowboys","version":"1.0","type":"link"}