{"product_id":"arp-ls-header-bolt-kit-for-chevrolet-gen-iii-ls-3-8-chromoly-bolts-170-000-psi","title":"ARP LS Header Bolt Kit for Chevrolet Gen III\/LS — 3\/8\" Chromoly Bolts, 170,000 psi","description":"\u003cp\u003e\u003cstrong\u003eARP 134-1202 is a high-strength chromoly header bolt kit engineered to secure Chevrolet Gen III\/LS headers with durable 3\/8\" wide fasteners rated at 170,000 psi.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen installing or replacing headers on Gen III\/LS Chevrolet engines, using bolts designed for the task ensures a reliable seal and long service life. ARP builds these kits from chromoly steel heat-treated for exceptional tensile strength, so they resist stretching and fatigue under repeated thermal cycling. Each kit contains the exact quantity of components required for the application, plus high-quality washers and the choice of hex or 12-point heads, finished in black oxide for corrosion resistance and a clean appearance.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose ARP chromoly fasteners for my LS header installation?\u003c\/h3\u003e\n\u003cp\u003eARP's chromoly bolts offer much higher load capacity than many OE or generic alternatives, reducing the risk of failure from vibration, heat, or overtightening. Their tensile rating and heat treatment process deliver consistent clamp force across multiple uses and rebuilds.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e170,000 psi tensile strength for superior durability\u003c\/li\u003e\n  \u003cli\u003eChromoly construction resists stretching and fatigue\u003c\/li\u003e\n  \u003cli\u003eBlack oxide finish adds corrosion protection and low-glare appearance\u003c\/li\u003e\n  \u003cli\u003eKits include premium washers to protect flange surfaces\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow complete is this ARP kit for Chevrolet Gen III\/LS headers?\u003c\/h3\u003e\n\u003cp\u003eThe kit is assembled specifically for Gen III\/LS header patterns and supplies the correct number of fasteners and accessories for a proper install. You get parts matched to the application so no last-minute trips to the parts store.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eContains the exact quantity of bolts required for the specified application\u003c\/li\u003e\n  \u003cli\u003eIncludes premium washers to ensure even load distribution\u003c\/li\u003e\n  \u003cli\u003eAvailable in hex or 12-point head styles to suit your tooling preference\u003c\/li\u003e\n  \u003cli\u003ePackaged for immediate use during header installation or replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these bolts hold up to repeated heat cycles and track use?\u003c\/h3\u003e\n\u003cp\u003eThe combination of chromoly alloy and ARP's heat-treatment yields bolts that maintain clamp integrity through aggressive thermal cycling. That stability is important for exhaust flanges that see wide temperature swings and vibration during spirited driving or racing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeat-treated chromoly resists permanent deformation under load\u003c\/li\u003e\n  \u003cli\u003eHigh tensile strength minimizes the chance of bolt failure\u003c\/li\u003e\n  \u003cli\u003eWashers help preserve flange flatness and gasket sealing over time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat torque or installation notes should I follow for best results?\u003c\/h3\u003e\n\u003cp\u003eFollow ARP's recommended torque sequence and values for header bolts, and use a calibrated torque wrench for accurate clamp load. Lubrication or ARP-specified assembly products may be advised to achieve consistent torque readings and prevent galling.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse proper torque wrench and follow a cross-pattern tightening sequence\u003c\/li\u003e\n  \u003cli\u003eRefer to ARP documentation for lubrication and torque values\u003c\/li\u003e\n  \u003cli\u003eChoose hex or 12-point heads based on available space and tools\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The ARP 134-1202 Chromoly Header Bolt Kit is intended for enthusiasts and professional mechanics working on Chevrolet Gen III\/LS engines who want a dependable, long-lasting fastener solution. It’s ideal for anyone replacing factory bolts, upgrading for higher durability under performance use, or rebuilding an engine where consistent flange clamping and corrosion-resistant finish are priorities.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these bolts stronger than stock fasteners?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. ARP chromoly bolts are rated at 170,000 psi, offering higher tensile strength and better resistance to stretching than typical factory hardware.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit include washers and correct quantity for Gen III\/LS?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit supplies the exact number of fasteners plus premium washers tailored for Chevrolet Gen III\/LS header installations.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":48083138674846,"sku":"B00E5YSJ5U","price":64.61,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/arp-chromoly-header-bolts-front_jpg.jpg?v=1785826152","url":"https:\/\/northtrailauto.ca\/products\/arp-ls-header-bolt-kit-for-chevrolet-gen-iii-ls-3-8-chromoly-bolts-170-000-psi","provider":"North Trail Auto","version":"1.0","type":"link"}