PLKHCU Copper Header Collector Gasket Kit for Small Block Chevy 305–383 with 3/8-16×1" Stainless Bolts — Heat‑Resistant Seal

This 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.

Will this gasket kit fit my engine and header setup?

The 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.

• Fits SB Chevy 305/327/350/383 and many BOP 350 V8 aftermarket headers
• Compatible with header flange thicknesses up to 1/2"
• Not compatible with factory OEM cast exhaust manifolds
• Check bolt length for specific cylinder fitment, especially 327 applications

Why choose copper gaskets and 18-8 stainless bolts?

Copper 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.

• Copper gaskets mold to flange irregularities for a tight seal
• High temperature tolerance better suited to header exhaust heat
• 18-8 stainless bolts offer corrosion resistance and reduced galling
• Included washers distribute clamping load to protect gasket material

How should I install these gaskets and bolts for best results?

Clean 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.

• Remove old gasket material and clean mating surfaces
• Hand-start each 3/8-16 bolt to avoid cross-threading
• Tighten bolts evenly in a crisscross sequence to spec
• Verify flange alignment and clearances prior to final torque

What does the package include and what should I check before buying?

The 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.

• 2 copper collector gaskets designed for header collectors
• Stainless 3/8-16×1" bolts and washers included for full install
• Inspect bolt length and flange thickness compatibility before purchase
• Contact seller with make, model, year and photos for support

Who 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.