{"product_id":"arp-230-4302-l5p-duramax-custom-age-625-head-stud-kit","title":"ARP Custom Age 625+ Head Stud Kit – 2017–2025 6.6L L5P Duramax – 230-4302","description":"\u003ch2\u003eARP Custom Age 625+ Head Stud Kit – 6.6L L5P Duramax\u003c\/h2\u003e\n\u003cp\u003eThe ARP Custom Age 625+ Head Stud Kit (230-4302) is engineered for 2017–2025 Chevrolet and GMC 6.6L L5P Duramax diesel engines. Designed for demanding, high-cylinder-pressure applications, this premium head stud kit provides increased fastening strength and improved resistance to fatigue compared to conventional cylinder head fasteners.\u003c\/p\u003e\n\u003cp\u003eManufactured from ARP's proprietary Custom Age 625+ super-alloy, these studs offer a nominal tensile strength of 260,000 PSI, making them an excellent choice for performance engine builds where maintaining consistent cylinder head clamping force is critical.\u003c\/p\u003e\n\u003cp\u003eWhether you're rebuilding an L5P Duramax or preparing an engine for increased boost and cylinder pressure, ARP Custom Age 625+ head studs provide additional strength and security for the cylinder head assembly.\u003c\/p\u003e\n\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom Age 625+ Super-Alloy:\u003c\/strong\u003e Premium high-strength material with a nominal tensile strength of 260,000 PSI.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased Clamping Strength:\u003c\/strong\u003e Designed to support cylinder head retention under elevated combustion pressures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcellent Fatigue Resistance:\u003c\/strong\u003e Engineered to withstand repeated loading and demanding engine operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Manufacturing:\u003c\/strong\u003e Centerless-ground studs with threads rolled after heat treatment to optimize fatigue strength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion Resistance:\u003c\/strong\u003e Custom Age 625+ material offers excellent resistance to atmospheric corrosion and oxidation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable Stud Design:\u003c\/strong\u003e Unlike factory torque-to-yield head bolts, ARP studs are designed to be reusable when properly inspected and installed according to ARP specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-Point Fasteners:\u003c\/strong\u003e Includes chrome-moly steel 12-point nuts and precision-ground washers for proper load distribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication-Specific Design:\u003c\/strong\u003e Engineered for the GM 6.6L L5P Duramax cylinder head configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKit Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e36 M12 ARP Custom Age 625+ head studs\u003c\/li\u003e\n\u003cli\u003e36 chrome-moly steel 12-point nuts\u003c\/li\u003e\n\u003cli\u003e36 parallel-ground washers\u003c\/li\u003e\n\u003cli\u003e12 M10 ARP 8740 chrome-moly intake valley bolts\u003c\/li\u003e\n\u003cli\u003eARP Ultra-Torque fastener assembly lubricant\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\n\u003cp\u003eFits the following vehicles equipped with the 6.6L L5P Duramax diesel engine:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2017–2025 Chevrolet Silverado 2500HD\u003c\/li\u003e\n\u003cli\u003e2017–2025 Chevrolet Silverado 3500HD\u003c\/li\u003e\n\u003cli\u003e2017–2025 GMC Sierra 2500HD\u003c\/li\u003e\n\u003cli\u003e2017–2025 GMC Sierra 3500HD\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEngine:\u003c\/strong\u003e GM 6.6L Duramax L5P\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eARP Part Number:\u003c\/strong\u003e 230-4302\u003c\/p\u003e\n\u003ch2\u003eInstallation Information\u003c\/h2\u003e\n\u003cp\u003eProper installation is essential to achieving the intended clamping force and performance of ARP head studs. Follow the installation instructions provided by ARP for part number 230-4302, including the specified thread preparation, lubrication, torque sequence, and torque values.\u003c\/p\u003e\n\u003cp\u003eARP Ultra-Torque fastener assembly lubricant is included with the kit and must be applied to the specified surfaces according to the manufacturer's instructions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Always follow ARP's installation instructions rather than factory head bolt torque specifications. Cylinder head gaskets are sold separately.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.arp-bolts.com\/instructions\/230-4302.pdf\" rel=\"noopener\" target=\"_blank\"\u003eDownload ARP 230-4302 Installation Instructions (PDF)\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eWhy Upgrade to ARP Custom Age 625+?\u003c\/h2\u003e\n\u003cp\u003eFactory torque-to-yield head bolts are designed around original engine operating requirements. When cylinder pressure increases beyond factory levels, additional cylinder head clamping strength can become important.\u003c\/p\u003e\n\u003cp\u003eARP Custom Age 625+ head studs provide a higher-strength fastening solution for performance-oriented L5P Duramax engines. Their material properties, precision manufacturing, and fatigue resistance make them well suited for builds where cylinder head sealing and fastening reliability are priorities.\u003c\/p\u003e\n\u003cp\u003eFor questions about selecting the correct head studs for your L5P Duramax, contact Industrial Injection at \u003ca href=\"tel:8009550476\"\u003e800-955-0476\u003c\/a\u003e.\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":67736751014022,"sku":"ARP230-4302","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0553\/1956\/0326\/files\/arp-230-4202_xl_3d9bf789-21dc-41ce-8e46-66d730a4e44b.jpg?v=1734631468","url":"https:\/\/industrialinjection.com\/products\/arp-230-4302-l5p-duramax-custom-age-625-head-stud-kit","provider":"Industrial Injection","version":"1.0","type":"link"}