LYNSHINE Copper Oval-Port Header Collector Gaskets for Chevy Small-Block 2PCS Reusable

LYNSHINE PH306 copper oval-port header collector gaskets are reusable, direct-fit exhaust seals designed for Chevy small-block engines 262–400.

These PH306 gaskets are engineered to restore a tight, heat-resistant seal between aftermarket headers or exhaust manifolds and the collector/on-carrier flange on compatible Chevrolet small-block V8s. Built from high-conductivity copper and manufactured to consistent tolerances, this two-piece set aims to reduce exhaust leaks, simplify installation, and survive repeated heating cycles that occur in high-temperature exhaust systems.

Which Chevy engines and applications will these gaskets fit?

The PH306 is made for classic and later small-block Chevy castings and many aftermarket headers that use oval ports. Compatible displacements include 262, 267, 283, 302, 305, 327, 350, 383, and 400. Always compare port shape and bolt pattern before purchase.

• Fits oval exhaust ports on listed small-block Chevy engines
• Works with many aftermarket and OEM-style headers
• Two gaskets included for one vehicle installation
• Check bolt spacing and port dimensions to confirm fit

How are these gaskets constructed and why choose copper?

Manufactured from high-quality copper, these header collector gaskets combine ductility and heat tolerance—qualities that help maintain a durable seal under repeated thermal cycles. Copper also conforms to minor flange irregularities better than many rigid materials, improving sealing without crushable fillers.

• High-conductivity copper resists warping from exhaust heat
• Engineered tolerances for consistent, repeatable sealing
• Reusable when inspected and not over-crushed
• Manufactured under quality control for dimensional accuracy

What should I know about installation and reusability?

Installation is straightforward with basic hand tools: align the gasket between the header collector and flange, then torque bolts to the header maker's or OEM specification. These copper gaskets are reusable provided they are not torn, excessively flattened, or distorted during removal.

• Install with correct torque sequence to avoid leaks
• Inspect gaskets for deformation before reusing
• Use new hardware if studs or bolts are corroded
• Two-piece pack covers one exhaust outlet set (left or right)

Can these help reduce common header/exhaust leak issues?

Yes — by using malleable copper and precise thickness, the PH306 gaskets help bridge small flange imperfections that often cause exhaust seepage. While no gasket can compensate for severely warped flanges or misaligned headers, these copper seals improve contact and lower the chance of ticking exhaust leaks.

• Conforms to uneven flange surfaces to improve sealing
• Durable under sustained high-temperature exposure
• Helps prevent exhaust noise and odor from leaks
• Best paired with properly machined, aligned flanges

Who is this for: The LYNSHINE PH306 gaskets suit restoration enthusiasts, hot-rodders, and anyone upgrading or replacing headers on Chevy small-block engines (262 through 400). They are a good choice if you want a reusable, heat-tolerant seal for oval-port headers and prefer copper’s ability to conform to imperfect flanges. If you’re fitting late-model specific manifolds or non-oval ports, measure your ports first to confirm compatibility. For installation problems, LYNSHINE offers customer support and requests pictures of fitment issues to assist with troubleshooting.