{"product_id":"pro-series-gm-gen-iii-iv-ls-header-bolt-kit","title":"Pro Series GM Gen III\/IV LS Header Bolt Kit","description":"\u003cp\u003eSecure your exhaust system with the \u003cstrong\u003ePro Series LS Header Bolt Kit\u003c\/strong\u003e, designed for GM Gen III and Gen IV LS engines.\u003cbr\u003e\u003cbr\u003eWhen installing headers or replacing exhaust manifold hardware, using the correct fasteners is critical for maintaining a proper seal. Factory bolts can loosen over time due to heat cycles and vibration, leading to exhaust leaks and reduced performance.\u003cbr\u003e\u003cbr\u003eThis kit provides reliable clamping force and consistent fitment, helping ensure a tight seal between the cylinder head and exhaust manifold or header flange. Designed for durability, these bolts are built to handle high-temperature environments commonly found in LS engine applications.\u003cbr\u003e\u003cbr\u003eManufactured from heat-treated high-strength steel, these fasteners offer improved resistance to stretching and loosening compared to worn or reused factory hardware. Whether you're installing aftermarket headers or refreshing OEM components, this kit delivers dependable performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCOMPATIBLE WITH\u003c\/strong\u003e\u003cbr\u003eCHEVROLET SMALL BLOCK V8 GEN. III\/IV (LS BASED)\u003cbr\u003e• 4.8L \/ 293 in3 (LR4 \/ LY2)\u003cbr\u003e• 5.3L \/ 325 in3 (LM7 \/ L59 \/ LC9 \/ LH6 \/ LY5)\u003cbr\u003e• 5.7L \/ 346 in3 (LS1 \/ LS6)\u003cbr\u003e• 6.0L \/ 364 in3 (LQ4 \/ LQ9 \/ LS2)\u003cbr\u003e• 6.2L \/ 376 in3 (LS3 \/ L92 \/ L99)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCOMMON VEHICLE APPLICATIONS\u003c\/strong\u003e\u003cbr\u003e• Chevrolet Silverado \/ GMC Sierra (4.8L \/ 5.3L \/ 6.0L \/ 6.2L)\u003cbr\u003e• Chevrolet Camaro \/ Pontiac GTO (LS1 \/ LS2 \/ LS3)\u003cbr\u003e• Chevrolet Corvette (C5 \/ C6 LS engines)\u003cbr\u003e• CTS-V (LS-based engines)\u003cbr\u003e• GM LS engine swap applications\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSPECIFICATIONS\u003c\/b\u003e\u003cbr\u003eTorque: 28ft-lbs\u003cbr\u003eColor: Black\u003cbr\u003eFastener Type: Header \/ exhaust manifold bolt\u003cbr\u003eGrade: Performance\u003cbr\u003eHead Style: Hex\u003cbr\u003eMaterial: 35 Chromoly Steel\u003cbr\u003eThread Size: M8 x 1.25\u003cbr\u003eLength: Approx. 25mm underhead\u003cbr\u003eQuantity: Sold as a kit\u003c\/p\u003e","brand":"Top Street Performance","offers":[{"title":"Default Title","offer_id":50550817292584,"sku":"734-86052","price":31.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0901\/8356\/5608\/files\/734-86052_01.jpg?v=1767633349","url":"https:\/\/www.topstreetperformance.com\/products\/pro-series-gm-gen-iii-iv-ls-header-bolt-kit","provider":"Top Street Performance","version":"1.0","type":"link"}