{"product_id":"arp-625-cylinder-head-stud-kit-for-mercedes-amg-m157-5-5l-biturbo-v8","title":"ARP 625+ Cylinder Head Stud Kit for Mercedes-AMG M157 (5.5L BiTurbo V8)","description":"\u003cp\u003e\u003cstrong\u003eThe ultimate head-stud solution for high-boost AMG builds.\u003c\/strong\u003e\u003cbr\u003eDesigned for extreme performance applications, the \u003cstrong\u003eARP 625+ Cylinder Head Stud Kit\u003c\/strong\u003e is the gold standard when it comes to engine sealing and reliability. Built for the \u003cstrong\u003eMercedes-AMG M157 5.5L BiTurbo engine\u003c\/strong\u003e, this kit is a must-have for anyone pushing serious boost or building a high-horsepower setup.\u003c\/p\u003e\n\u003cp\u003eWhether you’re upgrading turbos, running E85, or pushing well past stock power levels, ARP’s 625+ studs ensure your cylinder heads stay locked down — even under the most punishing conditions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e✅ Features \u0026amp; Benefits:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUnmatched Tensile Strength\u003c\/strong\u003e\u003cbr\u003eManufactured from \u003cstrong\u003eARP’s proprietary Custom Age 625+ material\u003c\/strong\u003e, delivering \u003cstrong\u003e260,000+ psi tensile strength\u003c\/strong\u003e — far stronger than factory bolts and even standard ARP 2000 hardware.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Boost Ready\u003c\/strong\u003e\u003cbr\u003eDesigned specifically to handle the extreme cylinder pressures of \u003cstrong\u003ebig-boost applications\u003c\/strong\u003e — including built engines, upgraded turbos, and aggressive tuning.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eComplete Head Stud Kit\u003c\/strong\u003e\u003cbr\u003eIncludes studs, 20-point nuts, and hardened parallel washers for even clamping force and long-term reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eReusability \u0026amp; Reliability\u003c\/strong\u003e\u003cbr\u003eUnlike OEM torque-to-yield bolts, ARP studs are reusable and provide consistent torque specs every time — ideal for engine builds or future teardown\/service.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePerfect Fit for M157 Applications\u003c\/strong\u003e\u003cbr\u003eEngineered for a precise fit in the M157 AMG block with no modification needed. Retains OEM head gasket compatibility.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e📈 Performance Advantages:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003ePrevents \u003cstrong\u003ehead lift and gasket failure\u003c\/strong\u003e under high boost\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEssential for \u003cstrong\u003e800+ HP builds\u003c\/strong\u003e or aggressive tuning setups\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSupports \u003cstrong\u003etrack, drag, and high-speed endurance applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIncreases \u003cstrong\u003elong-term reliability and engine safety\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e💬 Why Choose ARP 625+ for Your AMG?\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eM157 BiTurbo V8\u003c\/strong\u003e is a powerhouse — but factory head bolts aren’t made to handle the stress of high cylinder pressure. If you're upgrading turbos, running ethanol, or simply pushing past stock limits, \u003cstrong\u003eARP 625+ head studs are essential for keeping everything sealed and secure\u003c\/strong\u003e. This is the same premium hardware trusted by top engine builders and race teams worldwide.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e⚙️ Vehicle Compatibility:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMercedes-AMG E63 \/ E63S (W212)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCLS63 AMG (W218)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eS63 AMG (W221)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eML63 AMG (W166)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eGL63 AMG (X166)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAny model equipped with the \u003cstrong\u003eM157 5.5L BiTurbo V8\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e🔧 Installation:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eProfessional engine builder installation recommended\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTorque specs included with kit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWorks with OEM and aftermarket MLS head gaskets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e🔒 Lock In Power. Unlock Peace of Mind.\u003c\/h3\u003e\n\u003cp\u003eDon’t risk head lift or blown gaskets when chasing serious power. \u003cstrong\u003eUpgrade to ARP 625+ Head Studs\u003c\/strong\u003e — the trusted choice for high-performance AMG builds. \u003cstrong\u003eAdd to cart now\u003c\/strong\u003e and give your M157 the bulletproof foundation it deserves.\u003c\/p\u003e","brand":"TME Performance","offers":[{"title":"Default Title","offer_id":54988552962370,"sku":null,"price":2039.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7224\/2242\/files\/DSC07715.jpg?v=1784140277","url":"https:\/\/spoolperformance.com\/products\/arp-625-cylinder-head-stud-kit-for-mercedes-amg-m157-5-5l-biturbo-v8","provider":"Spool Performance","version":"1.0","type":"link"}