{"title":"Head Stud \u0026 Bolt Kits","description":null,"products":[{"product_id":"titan-motorsports-b58-s58-arp2000-damper-bolt-kit","title":"Titan Motorsports B58\/S58 ARP2000 Damper Bolt kit","description":"\u003cp class=\"MsoNormal\"\u003eTitan Motorsports, in collaboration with ARP, proudly presents an enhanced and robust damper bolt system crafted from ARP2000 material for the BMW B58 and S58 platform. This advanced bolt system boasts an impressive tensile strength of 220,000 PSI UTS, significantly outperforming the OEM standard. Engineered for durability and reliability, the ARP2000 damper bolt system ensures superior performance under the most demanding conditions. Upgrade your vehicle with Titan Motorsports' innovation for unparalleled strength and peace of mind.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e \u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eTorque spec = 80 ft\/lbs When using ARP Ultra Torque Lube included with the kit.\u003c\/p\u003e","brand":"Titan Motorsports","offers":[{"title":"Default Title","offer_id":45277915742361,"sku":"TMS MKV-ENG-123","price":129.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/2932\/2649\/files\/ARP_A90crankbolts_grande_e71a102e-c620-425d-b552-405bbf4c1c27.webp?v=1743953358"},{"product_id":"visconti-upgraded-2020-toyota-supra-a90-b58-crank-pulley-fastener-kit","title":"Visconti Upgraded 2020+ Toyota Supra A90 B58 Crank Pulley Fastener Kit","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe OE B58 Fasteners are TTY (Torque to Yield), this method is cheap to produce in large quantity using mediocre material standards. This method of fastening allows each fastener to reach its maximum theoretical elongation to provide maximum clamping force given that material property and strength. \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe major problem with this method is that the fasteners are not reusable. The second problem is that under scrutiny of clamp load 2 fasteners side by side are not applying the same appropriate force within reason.  If we cannot rely on even distribution of load, we cannot rely on these fasteners and its showing in the failures we are seeing. The third problem is the availability of replacements, this means a lot of these fasteners are not being replaced during engine rebuilds.\u003c\/p\u003e\n\u003cp\u003eThe OE B58 Crank pulley fasteners may be fine for OE properties, but they are not adequate for increased output.  The Crank pulley is a 4-piece design friction welded together and specifically uses the 4 bolts to hold it all together.  We are seeing the pulleys explode apart and taking out anything in its path. This includes but not limited to the crankshaft, coolant hoses, and the hood. Our fasteners are a must for big power B58 cars.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpecifically designed to support the load and tensile requirements of increased output.\u003c\/li\u003e\n\u003cli\u003eRequired to reach ASTM conformance certification.  All Material must conform to AMS batch raw materials.\u003c\/li\u003e\n\u003cli\u003eThread engagement and shank is optimized for each given bolt in its specific location. \u003c\/li\u003e\n\u003cli\u003eMeet or exceed a minimum allowable tensile strength of 190kpsi.  \u003c\/li\u003e\n\u003cli\u003eCustom age hardened \u003c\/li\u003e\n\u003cli\u003eCorrosion resistant, there is no coating or plate film to wear or degrade.\u003c\/li\u003e\n\u003cli\u003eReusable indefinitely unless over yielded past acceptable elongation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis kit contains 4 bolts, use red loctite and toque to 67ft\/lb\u003c\/p\u003e","brand":"Visconti Tuning","offers":[{"title":"Default Title","offer_id":45278119264409,"sku":"Visconti B58 Damper Bolts","price":240.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/2932\/2649\/files\/IMG_20220908_162205984_1024x1024_2x_1.webp?v=1743955822"},{"product_id":"visconti-tuning-upgraded-2020-toyota-supra-b58-cam-cap-bolts","title":"Visconti Tuning Upgraded 2020+ Toyota Supra B58 Cam Cap Bolts","description":"\u003cp\u003eThe OE B58 Fasteners are TTY (Torque to Yield), this method is cheap to produce in large quantity using mediocre material standards. This method of fastening allows each fastener to reach its maximum theoretical elongation to provide maximum clamping force given that material property and strength. \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe major problem with this method is that the fasteners are not reusable. The second problem is that under scrutiny of clamp load 2 fasteners side by side are not applying the same appropriate force within reason.  If we cannot rely on even distribution of load, we cannot rely on these fasteners and its showing in the failures we are seeing. The third problem is the availability of replacements, this means a lot of these fasteners are not being replaced during engine rebuilds.\u003c\/p\u003e\n\u003cp\u003eThe OE Cam Cap Bolts have been a problem BMW has been aware of for some time now. The hardware has been revised and certain models have open TSBs. Although the the improvements from BMW is a step in the right direction we feel this latest update isn't a fix. Our upgraded hardware kit will prevent the cam caps from becoming loose and causing damage to the cylinder heads casting.\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpecifically designed to support the load and tensile requirements of increased output.\u003c\/li\u003e\n\u003cli\u003eRequired to reach ASTM conformance certification.  All Material must conform to AMS batch raw materials.\u003c\/li\u003e\n\u003cli\u003eThread engagement and shank is optimized for each given bolt in its specific location. \u003c\/li\u003e\n\u003cli\u003eMeet or exceed a minimum allowable tensile strength of 190kpsi.  \u003c\/li\u003e\n\u003cli\u003eCustom age hardened \u003c\/li\u003e\n\u003cli\u003eCorrosion resistant, there is no coating or plate film to wear or degrade.\u003c\/li\u003e\n\u003cli\u003eReusable indefinitely unless over yielded past acceptable elongation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e2 port kits contain 7 long and 28 short bolts, use a dab of engine oil and toque to 13ft\/lb\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e6 port kits contain 13 long and 22 short bolts, use a dab of engine oil and toque to 13ft\/lb\u003c\/p\u003e","brand":"Visconti Tuning","offers":[{"title":"6 Port","offer_id":45278621302937,"sku":"Visconti B58 Cam Cap Bolts - 6 port","price":700.0,"currency_code":"USD","in_stock":true},{"title":"2 Port","offer_id":45278621335705,"sku":"Visconti B58 Cam Cap Bolts - 2 port","price":700.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/2932\/2649\/files\/IMG_0287_540x_1f8549f1-2f02-4957-94bf-c5493632f6cc.webp?v=1743957398"},{"product_id":"visconti-tuning-2020-toyota-supra-upgraded-b58-flex-plate-bolt-kit","title":"Visconti Tuning 2020+ Toyota Supra Upgraded B58 Flex Plate Bolt Kit","description":"\u003cp\u003eThe OE B58 Fasteners are TTY (Torque to Yield), this method is cheap to produce in large quantity using mediocre material standards. This method of fastening allows each fastener to reach its maximum theoretical elongation to provide maximum clamping force given that material property and strength. \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe major problem with this method is that the fasteners are not reusable. The second problem is that under scrutiny of clamp load 2 fasteners side by side are not applying the same appropriate force within reason.  If we cannot rely on even distribution of load, we cannot rely on these fasteners and its showing in the failures we are seeing. The third problem is the availability of replacements, this means a lot of these fasteners are not being replaced during engine rebuilds.\u003c\/p\u003e\n\u003cp\u003eThe OE B58 Flex plate fasteners may be fine for OE properties, but they are not adequate for increased output. We are not seeing these fall apart\/explode like the crank pulley.  These however are fretting\/friction welding the Flex Plate to the crankshaft.  The resulting failure is not only a new flywheel, but a new crankshaft as well. Our fasteners are a must for big power B58 cars.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpecifically designed to support the load and tensile requirements of increased output.\u003c\/li\u003e\n\u003cli\u003eRequired to reach ASTM conformance certification.  All Material must conform to AMS batch raw materials.\u003c\/li\u003e\n\u003cli\u003eThread engagement and shank is optimized for each given bolt in its specific location. \u003c\/li\u003e\n\u003cli\u003eMeet or exceed a minimum allowable tensile strength of 190kpsi.  \u003c\/li\u003e\n\u003cli\u003eCustom age hardened \u003c\/li\u003e\n\u003cli\u003eCorrosion resistant, there is no coating or plate film to wear or degrade.\u003c\/li\u003e\n\u003cli\u003eReusable indefinitely unless over yielded past acceptable elongation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis kit contains 8 bolts, use red loctite and toque to 120ft\/lb\u003c\/p\u003e","brand":"Visconti Tuning","offers":[{"title":"Default Title","offer_id":45279193825433,"sku":"visconti flexplate bolts b58","price":295.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/2932\/2649\/files\/IMG_20220908_162310407_1024x1024_2x_2dc7c8c6-d034-46bd-b8d3-51270ff8af73.webp?v=1743969700"},{"product_id":"visconti-tuning-2020-toyota-supra-upgraded-b58-girdle-and-oil-pump-bolts","title":"Visconti Tuning 2020+ Toyota Supra Upgraded B58 Girdle and Oil Pump Bolts","description":"\u003cp\u003eThe OE (Original Equipment) B58 Fasteners are TTY (Torque to Yield); a method that is economical to produce in large quantities with moderate material standards. This fastening technique allows each fastener to reach its maximum theoretical elongation, thereby providing maximum clamping force based on that material's property and strength.\u003c\/p\u003e\n\u003cp\u003eHowever, a significant issue with this method is the fasteners' non-reusability. Additionally, upon close examination of clamp load, it becomes evident that two fasteners positioned adjacently do not apply the same amount of force, which is problematic. If we cannot rely on the even distribution of load, we cannot trust these fasteners—as evidenced by the failures we are observing. Another concern is the availability of replacements, indicating that many of these fasteners are not being replaced during engine rebuilds.\u003c\/p\u003e\n\u003cp\u003eWhile the OE B58 Girdle fasteners may suffice for original equipment properties, they fall short for enhanced output. In higher power engines, we are noting fretting transfer on the main caps, between the caps and the girdle. Our upgraded hardware addresses these issues by preventing movement, making these fasteners essential for high-performance B58 engines.\u003c\/p\u003e\n\u003cp\u003eThe bolts are specifically designed to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupport the load and tensile requirements for increased output.\u003c\/li\u003e\n\u003cli\u003eAttain ASTM conformance certification. All materials must align with AMS raw materials batch standards.\u003c\/li\u003e\n\u003cli\u003eFeature optimized thread engagement and shank length for each specific bolt location.\u003c\/li\u003e\n\u003cli\u003eMeet or exceed a minimum tensile strength of 190kpsi.\u003c\/li\u003e\n\u003cli\u003eBe custom age-hardened.\u003c\/li\u003e\n\u003cli\u003eOffer corrosion resistance without any coatings or plating that could wear or degrade.\u003c\/li\u003e\n\u003cli\u003eBe indefinitely reusable unless stretched beyond the acceptable elongation limit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis kit includes 20 bolts; apply a dab of engine oil and torque each to 30 ft-lb.\u003c\/p\u003e\n\u003cp\u003eAdditional Information:\u003c\/p\u003e\n\u003cp\u003eThe ARP-661-1004 is an appropriate fastener for stock engine rebuilds as a replacement for the OE ones.\u003c\/p\u003e\n\u003cp\u003eThe factory specification, utilizing a 10.9 or 12.9 PSEUDO non-graded batch fastener, is 15nm + 45 degrees, equating to a torque value of approximately 25-35nm. However, this does not necessarily reflect the capability for effective clamp load. In other words, a higher torque rating does not guarantee effectiveness. The ARP equivalent (ARP-661-1004) made of 8740 chromoly has a maximum rating of 170Kpsi. Yet our testing indicates a nominal rating of 120Kpsi on one side and a maximum yield strength of 170Kpsi on the other. All 8740 fasteners lack ASTM ratings, so their performance lies anywhere between 120-170Kpsi.\u003c\/p\u003e\n\u003cp\u003eThe Visconti fastener also has a rated range, but we advertise only the lower end that is ASTM certified, between 190-210Kpsi.\u003c\/p\u003e\n\u003cp\u003eIf there were an ARP equivalent fastener, it would be between ARP 2000 and L19, costing approximately $50 per fastener.\u003c\/p\u003e\n\u003cp\u003eFurthermore, the Visconti fastener is not an outright replica of the OE design. It features a redesigned shoulder radial width and engagement which is functional to retain while allowing some conform-ability.\u003c\/p\u003e","brand":"Visconti Tuning","offers":[{"title":"Default Title","offer_id":45279196151961,"sku":"Visconti Tuning B58 Girdle and Oil Pump Bolts","price":500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/2932\/2649\/files\/GirdleBolts_540x_709ffc78-e05c-4c80-830e-e3dbd5403e32.webp?v=1743969982"},{"product_id":"arp-ca625-head-stud-kit-for-audi-daza-dnwa-10mm","title":"ARP 625+ Head Stud Kit for Audi DAZA DNWA 10mm TTRS RS3","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003ch4\u003e\u003cstrong\u003eThese are the strongest stock fitment (10mm) head studs available for the DAZA \u0026amp; DNWA engines.\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eCountless hours were spent torque testing and dissecting the block to design a stud that fits perfectly and engages all of the threads available.\u003c\/p\u003e\n\u003cp\u003eThis is our custom ARP CA625+ head stud kit for the Audi 2017+ DAZA \u0026amp; DNWA 2.5 TFSI engine.\u003c\/p\u003e\n\u003cp\u003eCustom Age 625 Plus®: This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness – with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Typical tensile strength is 260,000-280,000 psi.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e\u003cbr\u003e2017+ Audi 2.5 TFSI DAZA \u0026amp; DNWA\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":45464096342169,"sku":"OM-625-Head-10mm-DAZA","price":899.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/2932\/2649\/files\/071e099065bbd087d319f39f97943cb6.jpg?v=1739227523"},{"product_id":"arp-625-head-stud-kit-for-audi-daza-dnwa-12mm-ttrs-rs3","title":"ARP 625+ Head Stud Kit for Audi DAZA DNWA 12mm TTRS RS3","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003cp\u003eARP 12MM CA625+ head stud kit for the Audi 2017+ DAZA\/DNWA 2.5 TFSI engine.\u003c\/p\u003e\n\u003cp\u003eCustom Age 625 Plus®: This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness – with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Typical tensile strength is 260,000-280,000 psi.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline; background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eThese studs are NOT direct fit. Your engine block, cylinder head, and head gasket will have to be machined for these studs by a reputable machine shop.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e\u003cbr\u003e2017+ Audi DAZA \u0026amp; DNWA 2.5L TFSI\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":45464101257369,"sku":"OM-625-Head-12mm-DAZA","price":1295.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/2932\/2649\/files\/071e099065bbd087d319f39f97943cb6.jpg?v=1739227523"},{"product_id":"arp-625-head-stud-kit-for-audi-daza-dnwa-11mm-ttrs-rs3","title":"ARP 625+ Head Stud Kit for Audi DAZA DNWA 11mm TTRS RS3","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003cp\u003eARP 11MM CA625+ head stud kit for the Audi 2017+ DAZA\/DNWA 2.5 TFSI engine.\u003c\/p\u003e\n\u003cp\u003eCustom Age 625 Plus®: This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness – with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Typical tensile strength is 260,000-280,000 psi.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline; background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eThese studs are NOT direct fit. Your engine block \u0026amp; cylinder head will have to be machined for these studs by a reputable machine shop.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline; background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eThe head gasket does NOT need to be modified.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e\u003cbr\u003e2017+ Audi DAZA \u0026amp; DNWA 2.5L TFSI\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":45464101585049,"sku":"OM-625-Head-11mm-DAZA","price":850.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/2932\/2649\/files\/071e099065bbd087d319f39f97943cb6.jpg?v=1739227523"}],"url":"https:\/\/www.ostarmotorsports.com\/collections\/head-stud-bolt-kits.oembed","provider":"Ostar Motorsports","version":"1.0","type":"link"}