ARP 134-1202 Chromoly Header Bolt Kits Chevrolet Gen III LS Series

In this review the ARP 134-1202 Chromoly Header Bolt Kit is evaluated for anyone replacing or upgrading header fasteners on Chevrolet Gen III/LS engines. The bottom line: this kit is for owners who want a stronger, longer-lasting alternative to stock bolts during exhaust or header installation. Rated at 170,000 psi and built from steel with a black oxide finish, these bolts focus on longevity and reliable clamping force under heat and vibration, making them a practical choice for routine maintenance and performance exhaust work.

Key Features

• High tensile strength: The 170,000 psi rating delivers much greater clamp strength than typical factory bolts, reducing the chance of fastener stretch or failure under high-heat exhaust conditions.
• Chromoly steel construction: The steel material provides durable performance for long-term use in automotive exhaust applications where repeated heating and cooling occur.
• Black oxide finish: The finish helps resist corrosion and gives a low-gloss appearance that blends with most header and manifold finishes.
• Complete kit contents: Each kit includes the exact number of parts required for the application plus premium washers, simplifying installation without sourcing extra hardware.
• Head style options: Available with either hex or 12-point heads so installers can choose the drive style that matches their tools and access constraints.

Who It's For

This kit is ideal for owners of Chevrolet Gen III/LS series engines who are installing aftermarket headers or replacing worn OEM exhaust fasteners. It suits DIY mechanics, professional installers, and enthusiasts who prioritize reliability and component longevity in exhaust systems.

Those who should look elsewhere include buyers seeking stainless steel or ceramic-coated bolts for extreme corrosion resistance or for matching a specific visual finish not offered by a black oxide chromoly kit. Also, if you require non-steel materials for a particular application, select a different fastener grade.

Pros & Cons

Pros

• Much stronger than stock bolts thanks to the 170,000 psi rating, increasing durability under thermal cycling.
• Quality chromoly steel construction provides reliable performance in exhaust manifold and header installations.
• Includes the correct number of parts and premium washers, which streamlines installation and reduces parts hunting.

Cons

• Black oxide finish offers some corrosion resistance but is not as corrosion-proof as stainless steel options.

Specifications

Product	ARP 134-1202 Chromoly Header Bolt Kit
Engine fitment	Chevrolet Gen III / LS Series
Fastener material	Steel (chromoly)
Tensile strength	170,000 psi rating
Fastener finish	Black oxide
Fastener style	Bolt with hex or 12-point heads
Includes	Specific number of parts required plus premium washers

Our Verdict

The ARP 134-1202 kit is a solid choice for anyone replacing header fasteners on Chevy Gen III/LS engines who wants strength and dependable fit. It offers clear value through higher tensile strength and complete kit contents, making it worth the upgrade over stock hardware for most exhaust work and performance installs.

Frequently Asked Questions

Will these bolts fit my LS series header?
Yes, the kit is made specifically for Chevrolet Gen III/LS series installations and includes the correct number of parts for that application.

Are the bolts corrosion resistant?
The black oxide finish provides basic corrosion resistance and a subdued look, but it is not as corrosion-proof as stainless steel finishes.

Do I need special tools for the head styles?
Either standard hex sockets or a 12-point socket can be used depending on the head style included; choose the drive style that matches your tool access and preference.