{"product_id":"dtomi-sbc-copper-header-gaskets-for-small-block-chevy-327-305-350-383-oval-port-pair-heat-resistant-seal","title":"Dtomi SBC Copper Header Gaskets for Small Block Chevy 327\/305\/350\/383 Oval Port — Pair, Heat‑Resistant Seal","description":"\u003cp\u003e\u003cstrong\u003eDtomi SBC oval port copper header gaskets create a durable, leak-resistant seal between the Small Block Chevy cylinder head and aftermarket or stock exhaust headers.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese precision-cut copper gaskets are designed specifically for SBC (Small Block Chevy) engines — including 327, 305, 350, and 383 displacements — and replace part number PH306. Built to resist heat fatigue and blowout, they offer a long-lasting seal that helps preserve exhaust flow and reduce unwanted noise from header-to-head interfaces. Each package contains two gaskets, and Dtomi backs the part with one year of quality support.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these copper header gaskets improve my engine's exhaust connection?\u003c\/h3\u003e\n\n\u003cp\u003eProper sealing at the header-to-head joint prevents exhaust leaks that can lower performance and create irritating noise. Copper's thermal properties allow the gasket to conform under heat cycles while resisting degradation better than softer materials, maintaining back pressure and helping exhaust scavenging work as intended.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePrecision-cut to fit SBC oval-port headers without trimming.\u003c\/li\u003e\n  \u003cli\u003eCopper material conforms to mating surfaces for a tight seal.\u003c\/li\u003e\n  \u003cli\u003eReinforced construction reduces blowout and shrinkage over time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these gaskets fit my Small Block Chevy (327, 305, 350, 383)?\u003c\/h3\u003e\n\n\u003cp\u003eYes — these Dtomi gaskets are manufactured for Small Block Chevy engines that use oval-port header flanges and are listed compatible with 327, 305, 350, and 383 displacements. Confirm the flange shape and bolt pattern on your head and header before ordering if you have an uncommon aftermarket component.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eReplaces OEM\/reference part number PH306.\u003c\/li\u003e\n  \u003cli\u003eSpecifically cut for oval port SBC header flanges.\u003c\/li\u003e\n  \u003cli\u003eSold as a pair so both sides can be serviced at once.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is installation and what do I need to know before replacing them?\u003c\/h3\u003e\n\n\u003cp\u003eInstallation is straightforward for anyone familiar with removing and reinstalling exhaust headers. The gaskets are made to fit without trimming; ensure mating surfaces are clean and flat and use the correct torque sequence for your bolts to avoid warping the header flange.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNo trimming required — drops into standard oval-port flange openings.\u003c\/li\u003e\n  \u003cli\u003eClean mating surfaces and inspect bolts\/studs before assembly.\u003c\/li\u003e\n  \u003cli\u003eFollow proper torque specs and a progressive tightening pattern.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable are Dtomi copper header gaskets under repeated heat cycles?\u003c\/h3\u003e\n\n\u003cp\u003eCopper withstands high temperatures and repeated cycling better than many soft composite gaskets. Dtomi’s construction resists common failure modes such as shrinkage and blowout, giving longer service life and reducing the need for frequent replacement in daily drivers and performance builds alike.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eResistant to heat fatigue and thermal cycling.\u003c\/li\u003e\n  \u003cli\u003eReinforced to minimize blowout risk at high exhaust pressures.\u003c\/li\u003e\n  \u003cli\u003eSupports consistent exhaust flow and performance retention over time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: These Dtomi copper oval-port SBC header gaskets are meant for mechanics, home DIYers, and performance enthusiasts working on Small Block Chevy engines (327, 305, 350, 383) who need a reliable, precision-fit exhaust seal. Choose them if you want a tested, drop-in replacement for PH306 that balances conformability and durability for street or mild performance use.\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: Do these gaskets fit oval-port SBC headers?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. They’re cut for oval-port Small Block Chevy headers and replace part number PH306.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these copper gaskets reusable after removal?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Copper can sometimes be reused, but Dtomi recommends replacing gaskets during reassembly for the best seal.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Dtomi","offers":[{"title":"Default Title","offer_id":67593773973689,"sku":"B0FDWJG932","price":56.67,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/dtomi-front-packaging-sbc-header-gasket.jpg?v=1790578500","url":"https:\/\/redleafauto.ca\/products\/dtomi-sbc-copper-header-gaskets-for-small-block-chevy-327-305-350-383-oval-port-pair-heat-resistant-seal","provider":"Redleaf Auto","version":"1.0","type":"link"}