Choosing the right 3/8-inch header bolts can impact exhaust system performance, corrosion resistance, and ease of installation. This guide highlights top-rated 3/8 header bolts from trusted brands, detailing materials, finishes, and suitability for common V8 and LS engine setups. Each product section includes key features to help you compare options quickly.
| Product | Brand | Notes |
|---|---|---|
| ARP 100-1110 | ARP | Chrome moly with black oxide, 170,000 PSI |
| SeaEagles 100-1110 | SeaEagles | Chrome moly, black oxide finish, hex heads |
| ARP 134-1202 | ARP | Gen III/LS series, black oxide finish |
| ARP 4001209 | ARP | 3/8″ diameter, 1.000 under head, 12-point |
| Z Whip SBF BBF | Z Whip | 18-8 stainless, high-grade, 3/8-16×1” |
ARP 100-1110 1001110 Header Bolts
These premium-grade bolts are designed to simplify exhaust header installation. They are constructed from chrome moly steel and finished with black oxide for corrosion resistance. With a diameter of 3/8″ and an under-head length of 1.000″, this set includes 16 bolts to cover standard header flange patterns. Rated for high strength, they outperform typical Grade 8 hardware in demanding exhaust environments.
Key features include: 3/8″ diameter, 1.000″ under-head length, chromoly steel with black oxide, and a 16-piece kit. Ideal for enthusiasts seeking robust fasteners with improved strength-to-weight performance for exhaust headers used in daily drivers and performance builds alike.
SeaEagles 100-1110 Header Bolts
SeaEagles offers a 16-piece 100-1110 header bolt set crafted from chrome moly steel with a black oxide finish. The hex-style heads facilitate installation and removal with standard wrenches or sockets. This set emphasizes durability and corrosion resistance, making it suitable for a range of automotive, motorcycle, and industrial applications where reliable fasteners are essential.
Highlights include: chrome moly steel construction, black oxide finish, 16 bolts, hex-style heads, broad applicability across engines and components requiring sturdy header hardware.
ARP 134-1202 Chromoly Header Bolt Kit
This kit targets Chevrolet Gen III/LS series applications, offering high-strength chromoly bolts with a black oxide finish. The 3/8″ width aligns with common LS and performance header setups, delivering reliable torque retention and corrosion resistance in demanding environments. Finish and material choices focus on longevity under high heat and vibration.
Considerations: compatibility with LS and Gen III engines, 3/8″ diameter, chromoly material, black oxide finish, typical header flange requirements.
ARP 4001209 Header Bolts With 12-Point Heads
This set mirrors ARP’s premium design with 12-point heads and polished stainless steel construction for added corrosion resistance and an attractive finish. The 3/8″ diameter and 1.000″ under-head length match typical header bolt specs, and the kit includes 12 pieces suitable for many exhaust header installations where stainless hardware is preferred for longevity and aesthetics.
Z Whip SBF BBF Stainless-Steel Header Kit
Designed for Ford small- and big-block V8 engines, this stainless-steel kit uses high-grade 18-8 stainless steel bolts with washers. It includes 3/8-16×1″ bolts and washers that resist rust and corrosion compared with chrome or plain steel hardware. The kit emphasizes durability and reliability, with production standards aligned to aerospace-quality processes, and uses a 5/16″ Allen wrench/socket for installation.
ARP Header Bolt Kit 3/8 x 1.000 in Hex
ARP’s 3/8 x 1.000 in hex header bolt kit (Part 100-1110) is crafted from top-tier materials for high-strength performance. The hex head simplifies installation and removal with common tools, and the black oxide finish provides a balanced blend of corrosion resistance and a clean appearance under the hood.
ARP 400-1208 3/8″ x .750″ UHL Stainless Kit
This ARP kit features 3/8″ diameter bolts with a .750″ under-head length, built from stainless steel and designed for a balance of strength and corrosion resistance. The package includes related header studs/bolts and is manufactured in the USA, aligning with high-quality standards for reliable exhaust header installation.
SBC Stainless Steel Exhaust Header Kit
Designed for Chevrolet small-block exhaust headers, this stainless kit features 3/8-16 bolts with washers suitable for a wide range of V8 engines from 1955 to 1998/99. The stainless construction ensures resistance to rust and corrosion, and the kit supports headers with up to half-inch thick flanges for robust sealing under heat and vibration.
Buying Guide: Key Considerations For 3/8 Header Bolts
- Material and finish: Chrome moly steel offers high strength for performance exhausts, while stainless steel provides superior corrosion resistance in humid or salted environments. Finishes like black oxide can balance appearance with protection, but stainless hardware may be preferred for longevity.
- Strength ratings: Look for bolts rated well above standard Grade 8 hardware. High-strength fasteners (e.g., chrome moly) reduce the risk of galling, shearing, or loosening under vibration and heat.
- Head style: Hex or 12-point heads affect installation ease. Hex heads are common and work with standard wrenches; 12-point heads offer more torque distribution in tight spaces.
- Under-head length: Ensure the under-head length provides sufficient thread engagement without bottoming out the bolt in the flange or nut, especially on thicker headers.
- Corrosion resistance: Engines operate in high-heat environments; choosing bolts with oxide or stainless finishes helps prevent rust and seize, particularly on exposed exhaust components.
- Compatibility: Verify engine family and header flange thickness (common variants include up to 1/2″ flanges). Mismatched bolts can cause improper clamping and leaks.
- Kit completeness: Some sets include washers, studs, or related accessories. A complete kit can simplify installation and reduce the need for additional hardware purchases.
- Made in USA or certified quality: For precision and reliability, kits with strong manufacturing standards may offer better long-term performance and traceability.
Choosing between chromoly versus stainless options often comes down to a balance between strength and corrosion resistance. For frequent track use or salty climates, stainless kits can provide longer life, while chromoly sets may be favored for maximum strength in performance builds. Always confirm fitment with your specific engine model, header design, and flange thickness before purchasing.