{"product_id":"kooks-gm-ls-engines-1-7-8in-ss-ls1-flange-bank","title":"Kooks GM LS Engines 1 7\/8in SS LS1 Flange (Bank)","description":"\u003ch4\u003ePrecision Cut Single Bank Stainless Header Flange for GM LS1 Custom Exhaust Fabrication\u003c\/h4\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e7046-AS\u003c\/strong\u003e is a single bank 1 7\/8 inch stainless header flange for GM LS1 engines, providing the precision machined flange plate that fabricators need to build custom headers or replace a damaged flange on an existing set. Header flanges are the foundation of any header design, and the dimensional accuracy of the flange determines whether the header will seal correctly against the cylinder head, mount without binding, and maintain a flat mating surface through repeated heat cycles. Kooks machines this flange to the same specifications used in their production LS1 header builds, giving custom fabricators access to a flange that matches factory Kooks dimensional standards.\u003c\/p\u003e\n\n\u003cp\u003eThe 1 7\/8 inch port opening of the \u003cstrong\u003e7046-AS\u003c\/strong\u003e matches the primary tube size for standard LS1 header primary tube diameters, and the single bank format covers one cylinder head, meaning a complete V8 header set requires two flanges. Whether you are building a custom one off header, repairing cracked flanges on an existing set, or fabricating a budget header using quality Kooks components as the foundation, this flange is the correct starting point for a GM LS1 application. Stainless material ensures the flange holds its shape and surface flatness through years of heat cycling without the warping that plagues mild steel alternatives.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSingle bank flange for one cylinder head of a GM LS1 V8 engine\u003c\/li\u003e\n  \u003cli\u003e1 7\/8 inch port opening for standard LS1 primary tube diameter\u003c\/li\u003e\n  \u003cli\u003ePrecision machined to Kooks production header specifications\u003c\/li\u003e\n  \u003cli\u003eStainless steel construction for flatness retention under heat cycling\u003c\/li\u003e\n  \u003cli\u003eCorrect bolt hole pattern for GM LS1 cylinder head exhaust ports\u003c\/li\u003e\n  \u003cli\u003eSuitable for custom header fabrication and flange replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x this flange single bank 1 7\/8 inch LS1 header flange\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eDetail\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e7046-AS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eContact us for UPC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePort Opening\u003c\/td\u003e\n\u003ctd\u003e1 7\/8 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoverage\u003c\/td\u003e\n\u003ctd\u003eSingle Bank (One Cylinder Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eGM LS1 Engines\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUse\u003c\/td\u003e\n\u003ctd\u003eCustom Header Fabrication and Flange Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat engine does this flange fit?\u003c\/strong\u003e\u003cbr\u003e\nThis flange is designed for GM LS1 engines. It uses the correct bolt hole pattern and port opening dimensions for the LS1 cylinder head exhaust port configuration.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes this flange cover both cylinder heads?\u003c\/strong\u003e\u003cbr\u003e\nNo. This flange is a single bank flange that covers one cylinder head. A complete V8 header build requires two flanges, one per bank.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat primary tube diameter does this flange accept?\u003c\/strong\u003e\u003cbr\u003e\nThis flange has a 1 7\/8 inch port opening, which is designed to accept 1 7\/8 inch primary header tubes for welding.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this flange compatible with other LS engine variants besides the LS1?\u003c\/strong\u003e\u003cbr\u003e\nThis flange is specified for LS1 applications. Other LS variants such as LS2, LS3, and LS7 may use different head castings with different port dimensions. Verify compatibility with your specific head casting before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the material of this flange?\u003c\/strong\u003e\u003cbr\u003e\nStainless steel, providing dimensional stability and resistance to warping under the high temperatures of a performance exhaust system.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this flange with Kooks production header tubes?\u003c\/strong\u003e\u003cbr\u003e\nYes. This flange is designed to accept Kooks production primary tube sizing and bolt patterns, making it compatible with Kooks header fabrication components.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow is the primary tube attached to this flange flange?\u003c\/strong\u003e\u003cbr\u003e\nThe primary header tube is inserted into the port opening of this flange and welded in place using TIG welding with an appropriate stainless filler material.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes this flange include gaskets or hardware?\u003c\/strong\u003e\u003cbr\u003e\nThis flange is the flange plate only. Exhaust gaskets and header bolts are required separately. See the Kooks SS gasket and BK110 bolt kit listings for compatible hardware.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this flange machined flat?\u003c\/strong\u003e\u003cbr\u003e\nYes. This flange is precision machined to ensure a flat sealing surface that mates properly with the cylinder head without requiring additional surface preparation in most cases.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow thick is this flange flange?\u003c\/strong\u003e\u003cbr\u003e\nContact us for the exact flange thickness specification. A thicker flange provides greater resistance to warping under heat but adds weight. Kooks flanges are designed to balance these properties for performance applications.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n  \u003cli\u003eVerify this flange matches the bolt hole pattern and port dimensions of your specific LS1 cylinder head before beginning fabrication.\u003c\/li\u003e\n  \u003cli\u003eClean the cylinder head exhaust port surface and verify it is flat and free of damage.\u003c\/li\u003e\n  \u003cli\u003ePosition this flange flange against the cylinder head with the appropriate exhaust gasket in place to confirm fit and alignment.\u003c\/li\u003e\n  \u003cli\u003eRemove the flange from the head and proceed with primary tube fabrication, inserting and tack welding the header primary tubes to the flange port openings.\u003c\/li\u003e\n  \u003cli\u003eAfter completing the header tube layout, finish weld all primary tube to flange joints using TIG welding with stainless filler.\u003c\/li\u003e\n  \u003cli\u003eOnce the header assembly is complete, install it on the cylinder head with the appropriate gasket and torque the header bolts to specification.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch4\u003eProp 65 Warning\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e This product can expose you to chemicals including Chromium and Nickel, which are known to the State of California to cause cancer, birth defects or reproductive harm. For more information go to \u003ca href=\"https:\/\/www.p65warnings.ca.gov\" target=\"_blank\" rel=\"nofollow\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e.\u003c\/p\u003e","brand":"Kooks Headers","offers":[{"title":"Default Title","offer_id":41007241625679,"sku":"KSH7046-AS","price":45.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/products\/kooks-7046as-flange_01.jpg?v=1764346013","url":"https:\/\/www.blackopsautoworks.com\/products\/kooks-gm-ls-engines-1-7-8in-ss-ls1-flange-bank","provider":"Black Ops Auto Works","version":"1.0","type":"link"}