{"product_id":"arp-head-stud-kit-for-the-bmw-s55","title":"ARP\/VAC Head Stud Kit for the BMW S55","description":"\u003ch2 data-start=\"0\" data-end=\"62\" class=\"PDq2pG_selectionAnchorContainer\"\u003eVAC Motorsports ARP Head Stud Kit for BMW N55 \u0026amp; S55 Engines\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003cp data-start=\"64\" data-end=\"486\"\u003eSecure your engine build with the \u003cstrong data-start=\"98\" data-end=\"135\"\u003eVAC Motorsports ARP Head Stud Kit\u003c\/strong\u003e, engineered specifically for the \u003cstrong data-start=\"169\" data-end=\"188\"\u003eBMW N55 and S55\u003c\/strong\u003e engines. Developed in collaboration between \u003cstrong data-start=\"233\" data-end=\"252\"\u003eVAC Motorsports\u003c\/strong\u003e and \u003cstrong data-start=\"257\" data-end=\"264\"\u003eARP\u003c\/strong\u003e, this is not a generic retrofit solution—it is a purpose-built head stud kit designed to deliver superior clamping force, exceptional reliability, and long-term durability for high-performance and motorsport applications.\u003c\/p\u003e\n\u003cp data-start=\"488\" data-end=\"836\"\u003eAvailable in both \u003cstrong data-start=\"506\" data-end=\"517\"\u003eARP2000\u003c\/strong\u003e and \u003cstrong data-start=\"522\" data-end=\"550\"\u003eCustom Age 625+ (CA625+)\u003c\/strong\u003e materials, this kit is ideal for everything from fast road builds to high-boost track and race engines. Whether you're building a tuned street car or a dedicated competition vehicle, these premium head studs help maintain a consistent head gasket seal under extreme cylinder pressures.\u003c\/p\u003e\n\u003cp data-start=\"838\" data-end=\"1112\"\u003eUnlike alternative retrofit head stud kits originally intended for other engine platforms, the VAC Motorsports kit has been specifically engineered for the N55 and S55 architecture, providing the correct fitment and material specification required for long-term performance.\u003c\/p\u003e\n\u003ch3 data-start=\"1114\" data-end=\"1130\"\u003eKey Features\u003c\/h3\u003e\n\u003cul data-start=\"1132\" data-end=\"1780\"\u003e\n\u003cli data-start=\"1132\" data-end=\"1183\"\u003eDesigned specifically for BMW N55 and S55 engines\u003c\/li\u003e\n\u003cli data-start=\"1184\" data-end=\"1244\"\u003eDeveloped exclusively by VAC Motorsports and ARP engineers\u003c\/li\u003e\n\u003cli data-start=\"1245\" data-end=\"1424\"\u003eAvailable in:\n\u003cul data-start=\"1263\" data-end=\"1424\"\u003e\n\u003cli data-start=\"1263\" data-end=\"1335\"\u003e\n\u003cstrong data-start=\"1265\" data-end=\"1276\"\u003eARP2000\u003c\/strong\u003e – Ideal for high-performance street and track applications\u003c\/li\u003e\n\u003cli data-start=\"1338\" data-end=\"1424\"\u003e\n\u003cstrong data-start=\"1340\" data-end=\"1359\"\u003eCustom Age 625+\u003c\/strong\u003e – Ultimate strength for extreme horsepower and motorsport builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1425\" data-end=\"1501\"\u003eSuperior clamping force to maintain head gasket integrity under high boost\u003c\/li\u003e\n\u003cli data-start=\"1502\" data-end=\"1569\"\u003eProtects engine block threads compared to conventional head bolts\u003c\/li\u003e\n\u003cli data-start=\"1570\" data-end=\"1631\"\u003eSignificantly stronger than generic retrofit head stud kits\u003c\/li\u003e\n\u003cli data-start=\"1632\" data-end=\"1702\"\u003eTrusted by professional race teams and used in all VAC-built engines\u003c\/li\u003e\n\u003cli data-start=\"1703\" data-end=\"1780\"\u003eManufactured from premium aerospace-grade materials for maximum reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1782\" data-end=\"1798\"\u003eKit Contents\u003c\/h3\u003e\n\u003cp data-start=\"1800\" data-end=\"1818\"\u003eEach kit includes:\u003c\/p\u003e\n\u003cul data-start=\"1820\" data-end=\"1908\"\u003e\n\u003cli data-start=\"1820\" data-end=\"1846\"\u003e14 × 11mm ARP Head Studs\u003c\/li\u003e\n\u003cli data-start=\"1847\" data-end=\"1874\"\u003e14 × ARP Hardened Washers\u003c\/li\u003e\n\u003cli data-start=\"1875\" data-end=\"1908\"\u003e14 × ARP Aerospace-Quality Nuts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1910\" data-end=\"1932\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp data-start=\"1934\" data-end=\"1950\"\u003e\u003cstrong data-start=\"1934\" data-end=\"1950\"\u003eN55 Engines:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1952\" data-end=\"2139\"\u003eTo install this kit on an N55 engine block, the \u003cstrong data-start=\"2000\" data-end=\"2071\"\u003efour existing 9mm threaded holes must be drilled and tapped to 11mm\u003c\/strong\u003e, allowing all 14 head studs to utilise the same 11mm specification.\u003c\/p\u003e\n\u003cp data-start=\"2141\" data-end=\"2157\"\u003e\u003cstrong data-start=\"2141\" data-end=\"2157\"\u003eS55 Engines:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"2159\" data-end=\"2235\"\u003eDirect replacement installation with no engine block modifications required.\u003c\/p\u003e\n\u003ch3 data-start=\"2237\" data-end=\"2274\"\u003eRecommended Torque Specifications\u003c\/h3\u003e\n\u003cp data-start=\"2276\" data-end=\"2322\"\u003eUsing the supplied \u003cstrong data-start=\"2295\" data-end=\"2321\"\u003eARP Assembly Lubricant\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cp data-start=\"2324\" data-end=\"2335\"\u003e\u003cstrong data-start=\"2324\" data-end=\"2335\"\u003eARP2000\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"2336\" data-end=\"2395\"\u003e\n\u003cli data-start=\"2336\" data-end=\"2355\"\u003eStep 1: 30 ft-lbs\u003c\/li\u003e\n\u003cli data-start=\"2356\" data-end=\"2375\"\u003eStep 2: 60 ft-lbs\u003c\/li\u003e\n\u003cli data-start=\"2376\" data-end=\"2395\"\u003eStep 3: 90 ft-lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2397\" data-end=\"2416\"\u003e\u003cstrong data-start=\"2397\" data-end=\"2416\"\u003eCustom Age 625+\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"2417\" data-end=\"2477\"\u003e\n\u003cli data-start=\"2417\" data-end=\"2436\"\u003eStep 1: 30 ft-lbs\u003c\/li\u003e\n\u003cli data-start=\"2437\" data-end=\"2456\"\u003eStep 2: 70 ft-lbs\u003c\/li\u003e\n\u003cli data-start=\"2457\" data-end=\"2477\"\u003eStep 3: 110 ft-lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2479\" data-end=\"2562\"\u003eAlways follow the latest manufacturer installation procedures and torque sequences.\u003c\/p\u003e\n\u003ch3 data-start=\"2564\" data-end=\"2617\"\u003eWhy Choose the VAC Motorsports ARP Head Stud Kit?\u003c\/h3\u003e\n\u003cp data-start=\"2619\" data-end=\"2908\"\u003eWhen increasing boost levels or engine output, maintaining a reliable cylinder head seal becomes essential. The VAC Motorsports ARP Head Stud Kit provides significantly greater clamping force than factory head bolts, helping prevent head lift and gasket failure under demanding conditions.\u003c\/p\u003e\n\u003cp data-start=\"2910\" data-end=\"3207\"\u003eThis kit has been designed specifically for BMW N55 and S55 engines, eliminating the compromises associated with adapted Chrysler or Volvo stud kits. Trusted by professional engine builders and race teams worldwide, it delivers the strength and reliability required for serious performance builds.\u003c\/p\u003e\n\u003ch3 data-start=\"3209\" data-end=\"3234\"\u003eVehicle Compatibility\u003c\/h3\u003e\n\u003cp data-start=\"3236\" data-end=\"3275\"\u003eCompatible with BMW models fitted with:\u003c\/p\u003e\n\u003cul data-start=\"3277\" data-end=\"3310\"\u003e\n\u003cli data-start=\"3277\" data-end=\"3293\"\u003eBMW N55 Engine\u003c\/li\u003e\n\u003cli data-start=\"3294\" data-end=\"3310\"\u003eBMW S55 Engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3312\" data-end=\"3383\"\u003ePlease verify compatibility with your specific vehicle before ordering.\u003c\/p\u003e","brand":"ARP","offers":[{"title":"N55 \/ ARP2000","offer_id":53447589560648,"sku":"ARP-HSK-N55","price":549.0,"currency_code":"GBP","in_stock":true},{"title":"N55 \/ Custom Age 625+","offer_id":53447589593416,"sku":"ARP-HSK-N55-CA","price":960.0,"currency_code":"GBP","in_stock":true},{"title":"S55 \/ ARP2000","offer_id":53447589626184,"sku":"ARP-HSK-S55","price":549.0,"currency_code":"GBP","in_stock":true},{"title":"S55 \/ Custom Age 625+","offer_id":53447589658952,"sku":"ARP-HSK-S55-CA","price":960.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0919\/3576\/8904\/files\/ARP-Head-Main-Studs-UK_f56757c1-e7dc-486b-97ae-a4d995073be6.jpg?v=1764437807","url":"https:\/\/www.msmotorsport.uk\/products\/arp-head-stud-kit-for-the-bmw-s55","provider":"MS Motorsport Limited","version":"1.0","type":"link"}