LYNSHINE Copper Oval-Port Header Collector Gaskets for Small Block Chevy — 2-Pack Reusable, OEM-Style

LYNSHINE PH306 copper oval-port header collector gaskets—durable, reusable seals engineered to fit Small Block Chevy engines including 262, 283, 327, 350, 383 and 400.

These PH306 header collector gaskets are crafted from high-quality copper and manufactured to OEM-style dimensions so they seat reliably between the cylinder head or header flange and the exhaust collector. Sold as a 2-piece set, they’re intended for classic and performance Small Block Chevy applications where a tight exhaust seal is essential to reduce leaks, improve header fitment, and withstand repeated heat cycles.

Will these gaskets fit my Small Block Chevy engine?

LYNSHINE PH306 gaskets are made to match the oval port collector pattern used on many Small Block Chevy families. Check your header flange and collector to confirm the oval port shape and OEM part compatibility before ordering.

• Compatible engines: Chevy 262, 267, 283, 302, 305, 327, 350, 383, 400.
• OEM-style PH306 profile suits oval header collectors and stock-style manifolds.
• Measure flange bolt spacing and port outline to ensure exact fit.

How does a copper header gasket perform under heat?

Copper offers excellent thermal conductivity and resists warping, which helps maintain a consistent seal through repeated heating and cooling cycles. These gaskets compress to fill minor flange imperfections while retaining structural integrity at exhaust temperatures common in street and mild performance use.

• Copper material resists thermal deformation better than many softer metals.
• Reusable design allows gasket reinstallation when surfaces remain in good condition.
• Compression characteristics help seal uneven or pitted flanges without excessive torque.

What are the installation and maintenance tips?

Install on clean, flat flanges and torque bolts evenly to the header manufacturer’s specifications to avoid leaks or gasket distortion. Because copper gaskets can be reused, inspect them for excessive thinning, tears, or permanent deformation before reinstalling.

• Clean flange faces of old gasket material, rust, and carbon deposits.
• Hand-start bolts and tighten in a crisscross pattern to spec — avoid over-torquing.
• Inspect gaskets after initial heat cycles and retorque if necessary once cooled.

Why choose PH306 copper gaskets over other materials?

Copper delivers a balance of durability, heat resistance, and conformability that many mechanics prefer for classic V8 exhaust work. Compared with single-use fiber or composite options, copper can be reshaped and reused in many repair scenarios while maintaining a reliable seal.

• Higher longevity under repeated heating than basic composites.
• Good malleability to form a tight seal against imperfect flanges.
• OEM PH306 profile provides straightforward compatibility for common Chevy fittings.

Who is this for? The LYNSHINE PH306 copper oval-port collector gaskets are ideal for mechanics, restorers, and enthusiasts working on Small Block Chevy engines who need a dependable, reusable exhaust seal. They suit anyone replacing worn manifold gaskets, upgrading headers, or maintaining classic V8s where correct port shape and reliable heat cycling performance matter.