{"product_id":"jbroparts-exhaust-manifold-gasket-set-for-small-block-chevrolet-283-400-cid-steel-core-high-temp-pair","title":"JBROPARTS Exhaust Manifold Gasket Set for Small-Block Chevrolet 283–400 CID — Steel-Core High-Temp Pair","description":"\u003cp\u003e\u003cstrong\u003eJBROPARTS 1404 is a two-piece exhaust manifold gasket set engineered to seal square-port small-block Chevrolet engines from 283 to 400 CID with a steel-core, high-temperature construction.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen rebuilding or repairing a small-block Chevy exhaust manifold, the gasket is a small part that prevents noisy leaks, exhaust flow loss, and premature header or manifold damage. This JBROPARTS set matches the common square 1.50 x 1.50\" port pattern used across many 4.3L–6.6L V8 applications, and it ships as a pair so both heads are covered during an installation. The gaskets use a heat-resistant facing over a steel core to withstand exhaust temperatures and help maintain a long-lasting seal.\u003c\/p\u003e\n\n\u003ch3\u003eWhich engines and vehicles will this gasket fit?\u003c\/h3\u003e\n\u003cp\u003eThis gasket set suits classic small-block Chevrolet engines and several compatible models of late-1990s GM and related vehicles. It covers multiple displacements and model years where the square port pattern is used.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible engine displacements: 262, 265, 267, 283, 302, 305, 307, 327, 350, 400 CID.\u003c\/li\u003e\n  \u003cli\u003eFits vehicles including 1996–2000 Isuzu NPR, select Chevrolet C1500\/C2500 trucks and Suburbans (1996–1999\/2000), 1999–2000 Cadillac Escalade, and 1996 AM General Hummer models.\u003c\/li\u003e\n  \u003cli\u003eReplaces factory part number 1404 for like-for-like swaps.\u003c\/li\u003e\n  \u003cli\u003eSold as a set of two manifold gaskets for both cylinder heads.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the gasket's dimensions and construction details?\u003c\/h3\u003e\n\u003cp\u003eThe gaskets are designed to match square exhaust ports and to resist the thermal and mechanical stresses of exhaust service. Their measured port size and a reinforced core help deliver consistent sealing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePort shape: square; individual port dimensions 1.50 x 1.50 inches.\u003c\/li\u003e\n  \u003cli\u003eCore: steel-reinforced center for structural stability under bolt load.\u003c\/li\u003e\n  \u003cli\u003eFacing: high-temperature resistant sealing material on both faces for improved leak control.\u003c\/li\u003e\n  \u003cli\u003eThickness and crush characteristics tuned for common small-block manifold flange clearances.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I install and maintain these gaskets?\u003c\/h3\u003e\n\u003cp\u003eProper installation improves longevity and prevents leaks. Follow basic exhaust manifold procedures and inspect mating surfaces before putting the gasket in place.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eClean both manifold and head flanges, removing carbon, gasket residue and corrosion.\u003c\/li\u003e\n  \u003cli\u003eCheck for warpage; replace or machine warped flanges to ensure flat contact.\u003c\/li\u003e\n  \u003cli\u003eUse correct torque sequence and values for manifold bolts to avoid over-compression.\u003c\/li\u003e\n  \u003cli\u003eRe-torque if recommended by vehicle service manual after initial heat cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the package and what support is available?\u003c\/h3\u003e\n\u003cp\u003eThe set ships complete and includes manufacturer support in case of fitment or defect issues. JBROPARTS provides options for returns or exchanges if the product does not meet expectations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePackage contents: two JBROPARTS 1404 exhaust manifold gaskets.\u003c\/li\u003e\n  \u003cli\u003eReplacement reference: part number 1404 for cross-referencing.\u003c\/li\u003e\n  \u003cli\u003eCustomer care: return or exchange available if you encounter product problems.\u003c\/li\u003e\n  \u003cli\u003eSuitable for routine engine rebuilds, repairs, or performance header swaps that require square-port gaskets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This gasket set is aimed at DIY mechanics, professional technicians, and classic truck or SUV owners working on small-block Chevrolet engines from the 4.3L through 6.6L family who need a durable, square-port exhaust manifold gasket. It’s appropriate for restoration projects, routine maintenance, and exhaust upgrades on compatible 1990s-era GM and related vehicles where correct port size and reliable sealing are required.\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: Can these gaskets be used on both heads of a V8?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The set contains two gaskets intended to seal both exhaust manifolds on a V8 small-block Chevrolet.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these replace OEM part number 1404?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This JBROPARTS set is listed as a replacement for part number 1404 for compatible square-port applications.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"JBROPARTS","offers":[{"title":"Default Title","offer_id":48084568146078,"sku":"B0F6L7VW3S","price":33.34,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/jbroparts-1404-front-view-gasket-pair.jpg?v=1785859869","url":"https:\/\/northtrailauto.ca\/products\/jbroparts-exhaust-manifold-gasket-set-for-small-block-chevrolet-283-400-cid-steel-core-high-temp-pair","provider":"North Trail Auto","version":"1.0","type":"link"}