ARP 5349801 Black Oxide Steel Hex Engine & Fastener Kit

Description

Product Overview

The ARP 5349801 Black Oxide Steel Hex Engine & Fastener Kit is engineered for serious automotive builders who demand reliability and precision. Constructed from heat‑treated 8740 chrome‑moly alloy steel, each bolt and washer is finished with a robust black oxide coating that resists corrosion while delivering the high tensile strength associated with Grade 8 hardware. The kit contains twelve individual fasteners, each sized at 3/8 inch, and includes matching washers that conform to the exact dimensions required for high‑performance carbureted engines. All components are vacuum‑wrapped and clearly labeled, allowing for quick identification and streamlined installation on the shop floor.

Beyond the raw material specifications, the kit is designed with a traditional hex head style that provides a secure, torque‑friendly interface for standard wrenches and impact tools. The black oxide finish not only enhances visual appeal but also adds an extra layer of protection against the harsh environments typical of racing and performance applications. With a rated strength of 170,000 PSI, these fasteners surpass the capabilities of standard Grade 8 bolts, offering a margin of safety that is critical when engines are subjected to extreme pressures and temperatures.

Usage

Designed for a wide range of performance engine builds, this kit is ideal for assembling carbureted powerplants, rebuilding classic muscle cars, and upgrading modern street machines that require upgraded fastener strength. The 12‑piece configuration covers virtually every critical mounting point on a typical performance engine, from intake manifolds and carburetor brackets to oil pump housings and timing cover bolts. Whether you are a seasoned race team mechanic or a dedicated hobbyist, the kit’s comprehensive coverage ensures you have the right fastener on hand for each application, reducing the need for multiple part numbers and simplifying inventory management.

In addition to its primary use in engine assembly, the kit can be employed in aftermarket upgrades such as turbocharger mounts, supercharger brackets, and high‑flow exhaust manifolds where additional clamping force is required. The heat‑treated alloy maintains its structural integrity even after repeated heat cycles, making it suitable for engines that experience frequent tuning, dyno testing, or track days. The vacuum‑wrapped packaging also protects the components during shipping and storage, preserving the black oxide finish and preventing contamination that could compromise torque specifications.

Why Choose Us

ARP has a long‑standing reputation for producing high‑quality fasteners that meet the rigorous demands of motorsports and high‑performance automotive engineering. This kit reflects the company’s commitment to precision manufacturing, using state‑of‑the‑art heat‑treatment processes that ensure each bolt meets the exact tensile and shear strength requirements outlined in the ARP specifications. The black oxide coating is applied in a controlled environment to guarantee uniform thickness and adhesion, providing both aesthetic consistency and functional durability.

Our quality assurance program includes full traceability of each batch, rigorous testing for tensile strength, and compliance with industry standards such as SAE and ISO. Customers benefit from ARP’s extensive support network, which offers technical assistance, torque specifications, and fitment guidance for a broad spectrum of engine platforms. By choosing this kit, you are investing in a product that has been validated by professional race teams and endorsed by engineers who rely on ARP hardware for critical applications where failure is not an option.

Furthermore, the kit’s packaging is designed with the end‑user in mind. Each fastener is individually vacuum‑sealed, reducing the risk of loss or misplacement during complex builds. The clear labeling system aligns with ARP’s part numbering scheme, allowing for quick cross‑reference with OEM specifications and ensuring that you always install the correct component in the correct location.

Key Features

• Heat‑treated 8740 chrome‑moly steel provides superior tensile strength and durability.
• Black oxide finish resists corrosion and maintains a professional appearance under harsh conditions.
• 12‑piece kit includes all essential bolts and washers for complete engine assembly, reducing the need for additional purchases.
• Vacuum‑wrapped, clearly labeled packaging ensures easy identification and protects components during storage and transport.
• Backed by ARP’s technical support and warranty, offering peace of mind and reliable after‑sales service.

FAQ

What makes ARP Grade 8 fasteners different from standard Grade 8 bolts?

ARP Grade 8 fasteners are heat‑treated to a higher tensile strength and undergo a proprietary black oxide coating process that enhances corrosion resistance. The result is a bolt that can handle higher torque values and sustain greater loads, making it ideal for high‑performance engine applications where standard Grade 8 hardware might stretch or fail.

Can this kit be used on modern fuel‑injected engines, or is it limited to carbureted setups?

While the kit is optimized for carbureted engine builds, the dimensions and strength of the bolts make them suitable for many fuel‑injected applications as well. The 3/8‑inch size and hex head style are common across a variety of engine families, so you can confidently use the fasteners for mounting intake manifolds, fuel rails, and other components on both carbureted and fuel‑injected platforms.

Is the black oxide coating purely cosmetic, or does it provide functional benefits?

The black oxide coating serves both aesthetic and functional purposes. It gives the fasteners a sleek, uniform appearance that matches high‑performance engine builds, while also providing a thin protective layer that reduces the risk of surface rust and corrosion, especially in environments with high humidity or exposure to road salts.

What warranty or support does ARP offer for this fastener kit?

ARP provides a limited warranty that covers material defects and manufacturing errors for a specified period after purchase. In addition, ARP’s technical support team is available to answer fitment questions, provide torque specifications, and assist with any installation concerns, ensuring that you have the resources needed for a successful build.