Z Whip Stainless Steel LS Header/Manifold Bolt Kit M8x25mm — 12 Hardened 304 SS Bolts, Corrosion-Resistant

Z Whip's Stainless Steel LS header/exhaust manifold bolt kit is a set of 12 hardened 304 (18-8) M8x25mm bolts engineered to resist corrosion and tighten exhaust flanges on GM LS-series engines.

Upgrading the fasteners that secure your exhaust manifolds or aftermarket headers improves long-term reliability and reduces the risk of rusted or snapped bolts during routine maintenance. These bolts are made from hardened 304 stainless steel and sized for direct fitment on a wide range of GM LS engines, offering a durable replacement for OEM hardware when you want corrosion resistance and consistent clamping force.

Will these bolts fit my LS engine?

Yes — the kit is designed for broad compatibility across GM's LS family and many related variants. It replaces factory flange bolts where M8x25mm stainless hardware is required.

• Compatible with LS1, LS2, LS3, LS6, LS7, LS9, and LSX series engines.
• Fits Vortec 4.8L, 5.3L, 6.0L, 6.2L and other common GM V8s noted above.
• Works with OEM exhaust manifolds and most aftermarket headers that use M8 flange bolts.

How durable and corrosion-resistant are these bolts?

Manufactured from hardened 304 (18-8) stainless steel, these bolts offer strong resistance to rust and typical automotive corrosion. The hardness treatment increases shear and clamp performance compared with soft stock hardware.

• 304 stainless resists oxidation and road-salt corrosion better than standard steel.
• Hardened finish reduces likelihood of bolt stretching or failure under torque.
• Meets industry mechanical expectations and is produced under certified manufacturing controls.

What quality standards back these fasteners?

These bolts are produced by a manufacturer with aerospace-level quality systems, bringing traceability and controlled processes into automotive fasteners. That means tighter tolerances and consistent material properties across the set.

• Manufactured under AS9100D and ISO 9001:2015 certified processes.
• Parts produced with aerospace customers in mind, where reliability is critical.
• Designed to meet or exceed common ASME/ANSI hardware standards for mechanical performance.

How should I use and torque these bolts?

Use these bolts as direct replacements for manifold and header flange bolts that require M8x25mm length. Follow factory torque specs for your engine and consider anti-seize on threads where rework is likely to prevent galling.

• Install by hand first to avoid cross-threading, then torque to manufacturer-recommended values.
• Apply anti-seize or appropriate thread lubricant for repeated removal cycles.
• Replace any damaged studs or hardware that show wear before reassembly for proper sealing.

Who is this for? The Z Whip Stainless Steel LS header/exhaust manifold bolt kit is ideal for mechanics, restorers, and performance enthusiasts who want dependable, corrosion-resistant flange fasteners for GM LS-family engines. It suits anyone replacing rusted factory bolts, installing aftermarket headers, or seeking longer-lasting hardware that’s manufactured to industrial quality standards for consistent fit and performance.