{"product_id":"plkhcu-copper-header-collector-gasket-kit-for-small-block-chevy-305-383-with-3-8-16-1-stainless-bolts-heat-resistant-seal","title":"PLKHCU Copper Header Collector Gasket Kit for Small Block Chevy 305–383 with 3\/8-16×1\" Stainless Bolts — Heat‑Resistant Seal","description":"\u003cstrong\u003ePLKHCU Copper Header Collector Gasket with stainless 3\/8-16×1\" bolts is a ready-to-install header collector sealing kit engineered for Chevrolet Small Block V8 aftermarket headers (305–383) to deliver a reliable, heat-resistant exhaust seal.\u003c\/strong\u003e\n\n\u003cp\u003eThis kit combines two precision-cut copper collector gaskets with 18-8 stainless steel bolts and washers to address common exhaust join problems on aftermarket header installs. It’s tailored for Small Block Chevy and compatible BOP engines using aftermarket headers with flanges up to 1\/2\" thick. The copper gaskets provide heat tolerance and a malleable sealing surface while the stainless hardware resists corrosion and galling during installation and service.\u003c\/p\u003e\n\n\u003ch3\u003eWill this gasket kit fit my engine and header setup?\u003c\/h3\u003e\n\n\u003cp\u003eThe kit supports Chevrolet Small Block engines including 305, 327, 350 and 383, and fits aftermarket headers on many 1955–1999 Chevy small block applications. It also works with certain Pontiac, Buick, and Oldsmobile 350 V8s that use compatible aftermarket headers. Note that these gaskets are not intended for OEM cast manifolds.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFits SB Chevy 305\/327\/350\/383 and many BOP 350 V8 aftermarket headers\u003c\/li\u003e\n  \u003cli\u003eCompatible with header flange thicknesses up to 1\/2\"\u003c\/li\u003e\n  \u003cli\u003eNot compatible with factory OEM cast exhaust manifolds\u003c\/li\u003e\n  \u003cli\u003eCheck bolt length for specific cylinder fitment, especially 327 applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose copper gaskets and 18-8 stainless bolts?\u003c\/h3\u003e\n\n\u003cp\u003eCopper is soft enough to conform to imperfect flange surfaces while resisting high exhaust temperatures, reducing the chance of leaks at the collector joint. The 18-8 stainless steel bolts and washers included resist rust, reduce the risk of seizing, and maintain clamping force over time compared with plain carbon or chrome-plated bolts.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCopper gaskets mold to flange irregularities for a tight seal\u003c\/li\u003e\n  \u003cli\u003eHigh temperature tolerance better suited to header exhaust heat\u003c\/li\u003e\n  \u003cli\u003e18-8 stainless bolts offer corrosion resistance and reduced galling\u003c\/li\u003e\n  \u003cli\u003eIncluded washers distribute clamping load to protect gasket material\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I install these gaskets and bolts for best results?\u003c\/h3\u003e\n\n\u003cp\u003eClean mating surfaces thoroughly to remove old gasket material, soot, and rust before installing the copper gaskets. Hand-start bolts to avoid cross-threading, then torque evenly in a crisscross pattern to the header manufacturer’s recommended spec; over-tightening copper can deform the flange. Inspect fit and alignment before final torque.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eRemove old gasket material and clean mating surfaces\u003c\/li\u003e\n  \u003cli\u003eHand-start each 3\/8-16 bolt to avoid cross-threading\u003c\/li\u003e\n  \u003cli\u003eTighten bolts evenly in a crisscross sequence to spec\u003c\/li\u003e\n  \u003cli\u003eVerify flange alignment and clearances prior to final torque\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat does the package include and what should I check before buying?\u003c\/h3\u003e\n\n\u003cp\u003eThe package ships with two copper collector gaskets plus a complete set of 3\/8-16×1\" 18-8 stainless bolts and matching washers. Before ordering, confirm your header uses 3\/8-16 fasteners and that a 1\" bolt length is appropriate for the flange stack on your application; check clearance for cylinders known to require different bolt lengths.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e2 copper collector gaskets designed for header collectors\u003c\/li\u003e\n  \u003cli\u003eStainless 3\/8-16×1\" bolts and washers included for full install\u003c\/li\u003e\n  \u003cli\u003eInspect bolt length and flange thickness compatibility before purchase\u003c\/li\u003e\n  \u003cli\u003eContact seller with make, model, year and photos for support\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This kit is aimed at home mechanics, restoration enthusiasts, and performance shops installing or upgrading aftermarket headers on Chevy Small Block and compatible BOP V8 engines (1955–1999 era). Choose this set if you want a heat-resistant copper sealing surface plus corrosion-resistant stainless hardware for a long-lasting collector joint without needing to source multiple parts separately.\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: Will these gaskets fit OEM cast exhaust manifolds?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. These copper gaskets are intended for aftermarket headers only, not factory cast manifolds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the included bolts stainless and the correct length?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit includes 18-8 stainless 3\/8-16×1\" bolts and washers; verify 1\" suits your flange stack before installing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"PLKHCU","offers":[{"title":"Default Title","offer_id":48085932114078,"sku":"B0G2LVPLM1","price":49.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/plkhcu-front-packaging-gasket-kit.jpg?v=1785881103","url":"https:\/\/northtrailauto.ca\/products\/plkhcu-copper-header-collector-gasket-kit-for-small-block-chevy-305-383-with-3-8-16-1-stainless-bolts-heat-resistant-seal","provider":"North Trail Auto","version":"1.0","type":"link"}