{"product_id":"gm-4-2l-vortec-4200-manifold-flange-304-ss","title":"GM 4.2L Vortec 4200 Manifold Flange (304 SS)","description":"\u003ch3 data-end=\"502\" data-start=\"187\"\u003e\u003cspan style=\"color: #ff2a00;\"\u003eNOW AVAILABLE!\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-end=\"546\" data-start=\"203\"\u003e \u003c\/p\u003e\n\u003cp data-end=\"546\" data-start=\"203\"\u003eBuilding a turbo setup or custom header for the GM Vortec 4200 inline-6 (Atlas \/ Trailblazer SS–era 4.2L platform) starts with a solid flange. This is a raw, weld-ready exhaust manifold flange cut from 1\/2\" thick 304 stainless steel and left in a mill finish so you can port, match, and surface it exactly how your build needs.\u003c\/p\u003e\n\u003chr data-end=\"645\" data-start=\"642\"\u003e\n\u003ch2 data-end=\"658\" data-start=\"647\"\u003eFeatures\u003c\/h2\u003e\n\u003cul data-end=\"1040\" data-start=\"659\"\u003e\n\u003cli data-end=\"731\" data-start=\"659\"\u003e\n\u003cp data-end=\"731\" data-start=\"661\"\u003e\u003cstrong data-end=\"677\" data-start=\"661\"\u003eApplication:\u003c\/strong\u003e GM\u003cstrong\u003e \u003c\/strong\u003eVortec 4200 Inline-6 exhaust\/manifold builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"773\" data-start=\"732\"\u003e\n\u003cp data-end=\"773\" data-start=\"734\"\u003e\u003cstrong data-end=\"747\" data-start=\"734\"\u003eMaterial:\u003c\/strong\u003e 304 stainless steel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"811\" data-start=\"774\"\u003e\n\u003cp data-end=\"811\" data-start=\"776\"\u003e\u003cstrong data-end=\"790\" data-start=\"776\"\u003eThickness:\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003e1\/2\" (12.7 mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"858\" data-start=\"812\"\u003e\n\u003cp data-end=\"858\" data-start=\"814\"\u003e\u003cstrong data-end=\"825\" data-start=\"814\"\u003eFinish:\u003c\/strong\u003e Raw mill finish (uncoated)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"903\" data-start=\"859\"\u003e\n\u003cp data-end=\"903\" data-start=\"861\"\u003e\u003cstrong data-end=\"877\" data-start=\"861\"\u003eCut Process:\u003c\/strong\u003e Precision laser cut\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"982\" data-start=\"904\"\u003e\n\u003cp data-end=\"982\" data-start=\"906\"\u003e\u003cstrong data-end=\"920\" data-start=\"906\"\u003eUse Cases:\u003c\/strong\u003e Turbo manifolds, NA headers, custom downpipes, fab projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1040\" data-start=\"983\"\u003e\n\u003cp data-end=\"1040\" data-start=\"985\"\u003e\u003cstrong data-end=\"1000\" data-start=\"985\"\u003eWeld-Ready:\u003c\/strong\u003e Ideal for TIG\/MIG stainless fabrication\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1045\" data-start=\"1042\"\u003e\n\u003ch2 data-end=\"1068\" data-start=\"1047\"\u003eWhy 304 Stainless?\u003c\/h2\u003e\n\u003cp data-end=\"1120\" data-start=\"1069\"\u003e304 is a proven exhaust material because it offers:\u003c\/p\u003e\n\u003cul data-end=\"1318\" data-start=\"1121\"\u003e\n\u003cli data-end=\"1187\" data-start=\"1121\"\u003e\n\u003cp data-end=\"1187\" data-start=\"1123\"\u003e\u003cstrong data-end=\"1154\" data-start=\"1123\"\u003eStrong corrosion resistance\u003c\/strong\u003e for street and performance use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1252\" data-start=\"1188\"\u003e\n\u003cp data-end=\"1252\" data-start=\"1190\"\u003e\u003cstrong data-end=\"1219\" data-start=\"1190\"\u003eGood high-temp durability\u003c\/strong\u003e for manifolds and turbo setups\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1318\" data-start=\"1253\"\u003e\n\u003cp data-end=\"1318\" data-start=\"1255\"\u003e\u003cstrong data-end=\"1280\" data-start=\"1255\"\u003eExcellent weldability\u003c\/strong\u003e with common stainless filler metals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1323\" data-start=\"1320\"\u003e\n\u003ch2 data-end=\"1368\" data-start=\"1325\"\u003eImportant Note on Flatness (Please Read)\u003c\/h2\u003e\n\u003cp data-end=\"1575\" data-start=\"1369\"\u003e\u003cstrong data-end=\"1421\" data-start=\"1369\"\u003eThese flanges do arrive with a slight bow\/warp.\u003c\/strong\u003e\u003cbr data-end=\"1424\" data-start=\"1421\"\u003eThat’s normal for laser-cut 1\/2\" stainless — the cutting heat can introduce mild movement. This is common across the industry and \u003cstrong data-end=\"1575\" data-start=\"1558\"\u003enot a defect.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1684\" data-start=\"1577\"\u003eAfter welding, flanges should be surfaced flat to guarantee sealing. We recommend one of the following:\u003c\/p\u003e\n\u003cul data-end=\"1803\" data-start=\"1685\"\u003e\n\u003cli data-end=\"1736\" data-start=\"1685\"\u003e\n\u003cp data-end=\"1736\" data-start=\"1687\"\u003e\u003cstrong data-end=\"1706\" data-start=\"1687\"\u003eBlock sand flat\u003c\/strong\u003e on a known-flat surface, or\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1803\" data-start=\"1737\"\u003e\n\u003cp data-end=\"1803\" data-start=\"1739\"\u003e\u003cstrong data-end=\"1761\" data-start=\"1739\"\u003eMachine\/plane flat\u003c\/strong\u003e (best for high-boost or high-heat builds)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1922\" data-start=\"1805\"\u003eWelding heat can add a bit more movement, so final surfacing is standard practice on performance manifold builds.\u003c\/p\u003e","brand":"Foreverfabrication","offers":[{"title":"Default Title","offer_id":45995906498749,"sku":"FF-AT-42-MF-SS50","price":100.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1254\/5501\/files\/4200_Header_flange.png?v=1765722683","url":"https:\/\/shop.foreverfabrication.com\/products\/gm-4-2l-vortec-4200-manifold-flange-304-ss","provider":"Foreverfabrication","version":"1.0","type":"link"}