{"product_id":"kooks-dodge-hemi-09-5-7-6-1l-6-2l-stg-8-header-bolt-kit-m8-1-25-x-25mm-bolts-and-locking-hardware","title":"Kooks Dodge Hemi 09 5.7\/6.1L\/6.2L Stg 8 Header Bolt Kit -M8-1.25 x 25mm Bolts and Locking Hardware","description":"\u003ch4\u003eStage 8 Locking Header Bolts That Keep Dodge HEMI Headers From Backing Out\u003c\/h4\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eBK111\u003c\/strong\u003e is a complete Stage 8 locking header bolt kit for Dodge HEMI engines, including the 5.7L, 6.1L, and 6.2L variants, using M8 by 1.25 by 25mm fasteners with the Stage 8 locking hardware system that mechanically prevents the bolts from backing out under the vibration and thermal cycling of performance exhaust use. Header bolts are among the most commonly neglected fasteners on high performance exhaust systems, and on HEMI engines the combination of high operating temperatures, engine vibration, and the thermal expansion and contraction of stainless steel headers creates exactly the conditions that cause standard bolts to loosen over time.\u003c\/p\u003e\n\n\u003cp\u003eStage 8 locking hardware addresses this with a positive mechanical lock that does not rely on thread locking compound, spring tension, or torque alone to stay tight. The \u003cstrong\u003eBK111\u003c\/strong\u003e kit provides the correct fastener specification for HEMI header applications in a complete set that covers both cylinder heads. Using the right bolt length and thread pitch is critical on the HEMI head because an incorrect fastener can bottom out before clamping, leading to leaks even after a fresh installation. This bolt kit takes the guesswork out of fastener selection and delivers a solution from Kooks that is tested and proven on the same HEMI platform their headers are built for.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eStage 8 positive mechanical locking system prevents bolt back out\u003c\/li\u003e\n  \u003cli\u003eCorrect M8 by 1.25 by 25mm specification for Dodge HEMI 5.7L, 6.1L, and 6.2L cylinder heads\u003c\/li\u003e\n  \u003cli\u003eComplete kit covers both cylinder banks\u003c\/li\u003e\n  \u003cli\u003eNo thread locker or special tools required for the locking mechanism\u003c\/li\u003e\n  \u003cli\u003eResistant to loosening under exhaust system vibration and thermal cycling\u003c\/li\u003e\n  \u003cli\u003eDesigned for use with Kooks HEMI long tube headers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eStage 8 locking header bolts (M8 by 1.25 by 25mm), quantity as required for complete HEMI installation\u003c\/li\u003e\n  \u003cli\u003eStage 8 locking retainer clips for each bolt\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\u003eBK111\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\u003eBolt Size\u003c\/td\u003e\n\u003ctd\u003eM8 by 1.25 by 25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLocking System\u003c\/td\u003e\n\u003ctd\u003eStage 8 Positive Mechanical Lock\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eDodge HEMI 5.7L, 6.1L, 6.2L Engines\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUse With\u003c\/td\u003e\n\u003ctd\u003eKooks HEMI Long Tube Headers\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eDodge\/Chrysler HEMI V8 Applications\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 engines does this bolt kit fit?\u003c\/strong\u003e\u003cbr\u003e\nThis bolt kit is designed for Dodge HEMI engines, specifically the 5.7L, 6.1L, and 6.2L variants used in Challenger, Charger, 300, and other Chrysler platform vehicles.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is Stage 8 locking hardware?\u003c\/strong\u003e\u003cbr\u003e\nStage 8 is a brand and system of positive mechanical locking fasteners. Each bolt uses a retainer clip that locks into a groove on the bolt head and a fixed point on the header flange or adjacent hardware, preventing the bolt from rotating and loosening without mechanically defeating the lock. It is one of the most reliable anti loosening systems for high vibration, high temperature exhaust applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy do header bolts loosen on HEMI engines?\u003c\/strong\u003e\u003cbr\u003e\nThe HEMI produces significant thermal cycling across the cylinder head and header flange interface due to its high operating temperatures. Combined with engine vibration, this cycling causes standard bolts to slowly back out over time, resulting in exhaust leaks at the header flange.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this bolt kit bolts with a thread locking compound?\u003c\/strong\u003e\u003cbr\u003e\nThread locking compounds are not necessary with Stage 8 locking hardware and would be counterproductive since the locking retainer is the primary anti loosening mechanism. Standard installation follows the Stage 8 procedure with the retainer clips.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the bolt length of this bolt kit?\u003c\/strong\u003e\u003cbr\u003e\nThe bolts are 25mm in length with an M8 by 1.25 thread pitch, which is the correct specification for the HEMI cylinder head exhaust port bolt pattern used with Kooks headers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I need to re torque this bolt kit bolts after a heat cycle?\u003c\/strong\u003e\u003cbr\u003e\nStage 8 locking hardware maintains its clamping force more consistently than standard bolts across heat cycles. However, inspecting fastener tightness after the first heat cycle is always good practice with any header installation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this bolt kit with headers from other manufacturers?\u003c\/strong\u003e\u003cbr\u003e\nThis bolt kit uses the M8 by 1.25 by 25mm specification that matches Kooks HEMI header flange holes. Compatibility with headers from other brands depends on their flange bolt hole size and clearance for the Stage 8 locking hardware. Verify before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre the Stage 8 retainer clips reusable?\u003c\/strong\u003e\u003cbr\u003e\nStage 8 locking hardware is generally designed to be reusable. When removing headers, carefully retain the locking clips for reinstallation or replace them with fresh hardware.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this bolt kit the same as the BK110?\u003c\/strong\u003e\u003cbr\u003e\nNo. The BK110 is designed for GM LS engines and includes 12 pieces. This bolt kit is designed for Dodge HEMI applications with the fastener specification matching that engine's cylinder head.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes this bolt kit come with installation instructions?\u003c\/strong\u003e\u003cbr\u003e\nStage 8 locking hardware includes instructions for proper installation of the retainer clips. Follow those instructions for the correct installation procedure.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n  \u003cli\u003eClean the HEMI cylinder head exhaust port flange bolt holes and remove any old thread locking compound.\u003c\/li\u003e\n  \u003cli\u003eInstall new header gaskets on the cylinder head surface.\u003c\/li\u003e\n  \u003cli\u003ePosition the Kooks HEMI headers against the cylinder head with gaskets in place.\u003c\/li\u003e\n  \u003cli\u003eThread this bolt kit M8 by 1.25 by 25mm bolts by hand into the cylinder head bolt holes through the header flange.\u003c\/li\u003e\n  \u003cli\u003eTorque all bolts to the specification in the Kooks header installation instructions in a crossing pattern.\u003c\/li\u003e\n  \u003cli\u003eInstall the Stage 8 locking retainer clips onto each bolt head, securing the clip to the header flange or adjacent fixed point per Stage 8 instructions.\u003c\/li\u003e\n  \u003cli\u003eInspect all retainer clips to confirm they are fully engaged before starting the engine.\u003c\/li\u003e\n  \u003cli\u003eCheck bolt tightness after the first heat cycle and re torque if necessary, then reinstall retainer clips.\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 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":43692338151503,"sku":"KSHBK111","price":68.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/kooks_bk111_bolt_kit.png?v=1775166427","url":"https:\/\/www.blackopsautoworks.com\/products\/kooks-dodge-hemi-09-5-7-6-1l-6-2l-stg-8-header-bolt-kit-m8-1-25-x-25mm-bolts-and-locking-hardware","provider":"Black Ops Auto Works","version":"1.0","type":"link"}