{"product_id":"advance-headers-holden-6-cylinder-commodore-vc-vk-a85b","title":"Advance Headers | Mild Steel Engine Swap Extractors | Holden FX-HG Torana LC-UC Blue\/Black 6-Cyl | A85B","description":"\u003ch2\u003eAdvance Headers High-Performance Mild Steel Exhaust Extractors for Holden FX to HG \u0026amp; Torana LC to UC Blue \u0026amp; Black Engine Conversions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe Advance Headers Conversion Exhaust Extractors (A85B) are heavy-duty, multi-fit tubular manifolds custom-engineered for classic Australian Holden passenger cars and Torana platforms undergoing a modern inline 6-cylinder powerplant upgrade. Purpose-built to clear the structural complexities of early early-model chassis setups when retrofitting the later-generation, high-flowing 12-port Holden \"Blue\" and \"Black\" motor families, this premium manifold is manufactured from heavy-gauge mild steel to ensure exceptional thermal performance. By removing the restrictive factory cast log manifold architecture, this mandrel-bent assembly drastically drops engine backpressure, smoothing exhaust scavenging lines to maximize low-to-mid range torque and deliver a crisp, iconic street exhaust note.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"feature-block\"\u003e\n\u003cdiv class=\"feature-content pb-6\"\u003e\n\u003ch3 style=\"color: #e60000; font-weight: bold;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003ePRODUCT CONTENTS:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Heavy-Duty Mild Steel 6-Cylinder Performance 12-Port Conversion Extractor Assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEngineered with a highly adaptive multi-fit packaging matrix to drop into narrow early engine bays (FX through HG) and compact Torana platforms (LC through UC) cleanly\u003c\/li\u003e\n\u003cli\u003eSpecifically clearance-mapped to seal onto late-run 12-port head configurations without interfering with steering column paths or subframe rails\u003c\/li\u003e\n\u003cli\u003eTuned mandrel-bent primary piping pathways ensure completely uniform internal flow geometry, optimizing gas velocity and removing restrictive factory log traps\u003c\/li\u003e\n\u003cli\u003eHeavy-duty mild steel construction structurally built to handle intense under-bonnet thermal expansion cycles and typical high-torque inline-6 vibrations safely\u003c\/li\u003e\n\u003cli\u003eThick, precision laser-cut cylinder head flanges maintain a flat, ultra-stable mating footprint to permanently guard against face distortion, thermal warping, and gas leaks\u003c\/li\u003e\n\u003cli\u003eEngineered for an exceptionally fast workshop turnaround, featuring an estimated baseline installation window of just 1.5 hours\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv class=\"specs\"\u003e\n\u003cul class=\"flex flex-col space-y-2 text-xs\"\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eBrand:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eAdvance Headers\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003ePart Number:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eA85B\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eMaterial:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eMild Steel (Standard Finish)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eEngine Suitability:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eHolden 12-Port Inline 6-Cylinder Blue \u0026amp; Black Petrol Engines Only (2.8L \/ 3.3L \/ 4.2L \/ 5.0L Swaps onto early bodies)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eCylinder Head Configuration:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eFits 12-Port Head Patterns Only\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eComponent Type:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eEngine Swap Performance Exhaust Extractors \/ Headers\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eEstimated Fitting Time:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003e1.5 Hours\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eWelding Required:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eNo (Direct Bolt-On Configuration to Cylinder Head Face)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ Crucial Cylinder Head Architecture \u0026amp; Engine Variant Alignment Warnings:\u003c\/strong\u003e\u003cbr\u003e1. \u003cstrong\u003eStrictly 12-Port Blue \u0026amp; Black Blocks Only:\u003c\/strong\u003e This product (Part No. \u003cstrong\u003eA85B\u003c\/strong\u003e) is designed and flange-mapped exclusively for the \u003cstrong\u003e12-port layout native to Holden Blue and Black motor families\u003c\/strong\u003e. Because the exhaust port configurations, bolt index points, and manifold configurations are completely distinct, these headers will \u003cstrong\u003eNOT fit standard early 9-port Red motors\u003c\/strong\u003e.\u003cbr\u003e2. \u003cstrong\u003eEngine Swap Tolerances:\u003c\/strong\u003e Formed to navigate past steering components and crossmembers across multiple early chassis generations. However, due to the variance in aftermarket engine swap conversion mounts, careful alignment with local steering shaft links should be double-checked before fixing the collector setup down.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePlease Note: Due to the custom nature of retrofitting later 12-port engines into early vintage bodies, professional installation by an experienced classic car specialist or exhaust restoration workshop is highly recommended.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eImportant Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThe image shown may not reflect the actual product design.\u003c\/li\u003e\n\u003cli\u003eEnsure your vehicle details match the application guide below before purchasing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"font-family: Arial, sans-serif; max-width: 100%; padding: 20px; border: 1px solid #ccc; border-radius: 5px; font-size: 1rem;\" class=\"product-details-container\"\u003e\n\u003ch2\u003eVehicle Conversion Applications for A85B Performance Engine Swaps\u003c\/h2\u003e\n\u003cdiv style=\"width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 10px;\"\u003e\n\u003ctable style=\"min-width: 1100px; border-collapse: collapse; font-size: 1rem; line-height: 1.5; width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f0f0f0; border-bottom: 3px solid #333;\"\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd; white-space: nowrap;\"\u003eMake\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd; white-space: nowrap;\"\u003eModel Range\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd; white-space: nowrap;\"\u003eChassis Compatibility Range\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd;\"\u003eBody Type\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd;\"\u003eChassis Series\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd;\"\u003eEngine Conversion Details\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd; white-space: nowrap;\"\u003eFitting Time\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd;\"\u003eConversion \u0026amp; Fitment Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eHolden\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eEarly Passenger \/ Kingswood \/ Monaro\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e1948 – 1971 (Chassis Profiles)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e4-Door Sedan \/ 5-Door Station Wagon \/ Utility (Ute) \/ Panel Van \/ Coupe\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eFX \/ FJ \/ FE \/ FC \/ FB \/ EK \/ EJ \/ EH \/ HD \/ HR \/ HK \/ HT \/ HG Series\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eHolden 12-Port Blue or Black Inline 6-Cylinder Retrofit Swaps\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e1.5 Hours\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eRWD | Mandrel-bent upgrade conversion routing mapped to snake past vintage steering boxes and original chassis firewalls cleanly. Designed for 12-port heads only. Fits auto and manual models.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eHolden\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eTorana \/ Sunbird\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e1969 – 1980 (Chassis Profiles)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2-Door Coupe \/ 4-Door Sedan \/ 3-Door Hatchback\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eLC \/ LJ \/ TA \/ LH \/ LX \/ UC Series Only\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eHolden 12-Port Blue or Black Inline 6-Cylinder Retrofit Swaps\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e1.5 Hours\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eRWD | Clearance-profiled primary pipes dodge tight Torana rack and pinion paths and engine bay crossmembers efficiently. Excludes early 9-port Red motors.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003ePayment \u0026amp; Security\u003c\/h2\u003e\n\u003cp\u003eYour payment information is processed securely. We do not store credit card details nor have access to your credit card information.\u003c\/p\u003e","brand":"Advance Headers","offers":[{"title":"Default Title","offer_id":45735852048546,"sku":"A85B","price":555.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0576\/1112\/4898\/files\/A213-37-520x375_233fc080-92fa-4262-a5b7-3fef72a148df.jpg?v=1754416119","url":"https:\/\/nationaltowbars.com.au\/products\/advance-headers-holden-6-cylinder-commodore-vc-vk-a85b","provider":"National Towbars Australia","version":"1.0","type":"link"}