Choosing the right 5/16 header bolts is essential for a secure, long-lasting exhaust setup. This guide highlights top options from trusted brands, focusing on strength, corrosion resistance, and ease of installation. Whether you are upgrading a GM LS engine, a classic American V8, or a performance build, the following selections cover common 5/16 inch bolt sizes and ensure reliable torque retention under high heat. The products below are organized to help you compare materials, finishes, and head styles so you can select bolts that suit your engine and application.
Summary Of Chosen Products
| Product | Brand | Type | Finish/Material | Notes |
|---|---|---|---|---|
| ARP 100-1110 | ARP | Header Bolts Kit | Chrome Moly with Black Oxide | High strength, 3/8″ diameter, 1.000 under-head length, 16 pieces |
| Patriot H7977 | Patriot | Header Bolts | Zinc Plated | 5/16″-18 x 1″, pack of 12 |
| Trans-Dapt 4900 | TRANSDAPT | Header Bolts | Unspecified metal | 5/16″ bolts, compact package |
| 269 Motorsports SBM 273/318/340/360 | 269 Motorsports | Header Stud Kit Bolts | Stainless Steel 304 | Small block 5/16, includes bolts for header installation |
| Spectre 46723 | Spectre | Header Bolts | Gold iridite, Grade 5 | 3/8″-16 x 7/8″ |
ARP 100-1110 Chrome Moly Header Bolts
ARP’s 100-1110 header bolt kit combines premium materials with a strong performance profile. These bolts use chrome-moly steel and come with a black oxide finish, designed to withstand high exhaust temperatures and demanding engine environments. The kit includes 16 bolts of 3/8 inch diameter with a 1.000 under-head length, providing a robust fastening solution for most modern exhaust header installations. ARP’s manufacturing focuses on precision threading and consistent torque retention, which helps prevent loosening under vibration. The high-grade material and finish also resist corrosion, contributing to a longer service life in harsh automotive conditions. This option is well-suited for performance builds where reliability and durability matter as much as appearance.
Key considerations:
– Material strength: Chrome Moly steel offers superior tensile strength.
– Finish: Black oxide provides basic corrosion resistance and a clean look.
– Application: Suitable for a range of headers and cylinder head configurations that use 3/8″ bolts.
Patriot H7977 5/16-18 x 1″ Zinc Header Bolts
The Patriot H7977 set provides a practical option for standard exhaust header installations. Each bolt is 5/16 inch in diameter and 18 threads per inch, with a 1-inch length. The zinc plating is chosen to minimize corrosion over time in typical automotive environments. Packaged in sets of 12, this kit is a convenient choice for completing a header install while ensuring enough fasteners are available for a proper, symmetric layout across all cylinder banks. The finish helps resist rust in the presence of road salt and hot engine conditions, making it a solid fit for daily drivers and performance projects alike.
Key considerations:
– Size and pitch are common for many stock and upgraded headers.
– Zinc plating balances cost with corrosion protection.
– Pack quantity supports complete header installation on most V8 engines.
269 Motorsports SBM 273/318/340/360 Stud Kit Bolts
269 Motorsports offers a stainless steel solution designed for small-block engines with 5/16-inch hardware. The SBM 273/318/340/360 header stud kit features hardened 304 stainless steel construction, providing excellent corrosion resistance and durability under heat. The kit is intended to simplify header installation by including studs and bolts that facilitate secure attachment to the cylinder heads and exhaust manifolds. While the description highlights stainless steel, it is important to verify whether the kit contains bolts or studs suitable for your particular header flange pattern. This option is suitable for enthusiasts prioritizing longevity and resistance to high-temperature oxidation.
Key considerations:
– Material: Hardened 304 stainless steel improves corrosion resistance.
– Application: Targeted toward small-block Mopar and other generic small-block configurations.
– Installation: Stud-based approach can ease header alignment during installation.
Spectre 46723 7/8″ Header Bolt
Spectre’s 46723 header bolt is designed for broad compatibility across General Motors, Ford, and many Chrysler platforms. The bolt measures 3/8-inch in diameter and 7/8 inch in length, featuring a Grade 5 specification with a gold iridite reversible head and tool compatibility. This option is suitable for users who want a balance between strength and ease of installation, particularly when working with larger header flanges or thicker gaskets. The gold iridite coating provides an attractive finish that can resist heat-driven discoloration and corrosion in a performance setting. It is important to confirm bolt length matches your header and gasket stack height to ensure proper engagement with the exhaust manifold.
Key considerations:
– Head style and finish: Gold iridite head offers corrosion resistance with a distinctive appearance.
– Application range: Compatible with multiple domestic manufacturers and common exhaust configurations.
– Strength: Grade 5 provides a reliable, mid-high strength option for typical header loads.
SeaEagles 100-1110 Chrome Moly Header Bolts Set
SeaEagles presents a robust 16-piece set of 100-1110 header bolts crafted from chrome moly steel with a black oxide finish. The combination delivers high strength and resistance to corrosion, making it a strong choice for performance builds that place heavy demands on fastening hardware. The hex-style heads enable straightforward installation with standard wrenches or sockets, and the billet-grade material supports repeated heat cycling without significant bolt relaxation. This kit is versatile for a wide array of automotive, motorcycle, and industrial applications where dependable fasteners are required, particularly in high-heat exhaust environments.
Key considerations:
– Material and finish: Chrome moly with black oxide provides durability and a clean look.
– Versatility: Suitable for various engines and industrial uses beyond stock configurations.
– Installation: Hex-style heads simplify wrench access in tight spaces.
BEONEO 551696 Exhaust Manifold Bolts Kit
The BEONEO 551696 kit offers compatibility with GM LS and LT engines, including LS1, LS3, LS2, LSX, and LT series. These 10.9 bolts provide heavy-duty fastening with galvanization and an additional black coating to enhance corrosion protection and reduce thread seizure. While the description emphasizes compatibility with GM LS family, the bolts are suitable for other applications that require strong, heat-tolerant exhaust fasteners. This kit is positioned as a practical option for engine swaps or upgrades where LS-style manifolds are involved, ensuring reliable sealing and torque retention over time.
Key considerations:
– Compatibility: Primarily targeted at GM LS/LT engines but adaptable to other configurations with matching thread pitch.
– Strength: 10.9 grade bolts emphasize high tensile strength for demanding installations.
– Coating: Galvanized with a black coating for enhanced corrosion resistance.
Buying Guide: Key Purchase Considerations
- Material and strength: For high-heat exhaust environments, chrome moly steel, stainless steel, or Grade 5 fasteners offer the best performance. Avoid softer materials in performance builds to reduce the risk of stripping or loosening.
- Finish and corrosion protection: Finishes like black oxide, zinc plating, or ceramic coatings improve corrosion resistance and appearance. Consider the climate and road conditions where the vehicle operates.
- Bolt length and thread pitch: Ensure the bolt length is appropriate for your exhaust flange thickness and gasket height. Common 5/16-18 threads fit a wide range of headers, but check your specific flange pattern.
- Head type and accessibility: Hex heads, fluted or flush heads influence ease of installation, especially in tight engine bays. Verify that you have the right wrenches or sockets for access.
- Quantity and kit contents: For most V8 headers, a 12-16 bolt kit helps complete both sides of the exhaust, including spare bolts for potential replacements over time.
- Application compatibility: Some bolts are designed for specific engines or header brands. Confirm compatibility with your engine family (GM LS, small-block, Mopar, etc.) and the header flange pattern.
- Installation considerations: Some kits include studs or mixed bolt/stud configurations. For complex installations, a stud kit can ease alignment but verify replacement needs for each cylinder.
- Cost vs. value: Higher-strength materials cost more but can reduce maintenance and replacement intervals. Balance budget with expected usage and maintenance plans.
- Warranty and manufacturer support: Choose brands with documented torque specs and engineering guidance to ensure proper installation and safety.
When selecting 5/16 header bolts, prioritize reliability under heat, compatibility with your engine and header, and long-term corrosion resistance. The products listed above span premium and value options across chrome moly, stainless, and coated finishes, helping you find a solution that matches your build goals and maintenance expectations.