12-Piece Small Block Chevy Header Bolt Set
Secure your exhaust headers with this 12-Piece Small Block Chevy Header Bolt Set, engineered for strength, durability, and easier installation in tight engine bays. Made from heat-treated 42CrMo alloy steel to Grade 8 specifications, these bolts provide reliable clamping strength in high-heat, high-vibration exhaust environments.
The compact 5/16" hex heads improve tool access around header tubes, making them ideal for block hugger headers, performance builds, and confined engine compartments. The integrated flange design distributes clamping force without requiring separate washers, while the black phosphate finish helps resist corrosion.
Key Features
- 12-piece header bolt set for Small Block Chevy engines
- Heat-treated 42CrMo alloy steel construction
- Grade 8 specifications
- Compact 5/16" hex heads for tight-clearance installations
- Integrated flange design eliminates separate washers
- Black phosphate and blackened corrosion-resistant finish
- Designed for reliable clamping under heat and vibration
- Ideal for restorations, muscle cars, street rods, and performance builds
Engine Compatibility
Designed for compatible Chevy Small Block V8 engines:
- 265, 283, 302, 305, 307, 327, 350, and 400 CID
Note: This kit contains 12 bolts. Applications requiring 16 header bolts need a compatible 16-piece kit. Verify thread size, bolt length, and header compatibility before ordering.
Specifications
- Quantity: 12 Bolts
- Material: Heat-Treated 42CrMo Alloy Steel
- Strength Specification: Grade 8
- Hex Head Size: 5/16"
- Design: Integrated Flange
- Finish: Black Phosphate/Blackened Coating
- Application: Compatible Small Block Chevy Headers
Installation Recommendations
Use anti-seize lubricant and follow the header manufacturer's torque specifications. A torque range of 25–30 ft-lbs is provided as a reference, but confirm the correct value for your specific application before installation. Recheck fasteners after the initial heat cycle when appropriate.
Frequently Asked Questions
How many bolts are included?
This set includes 12 header bolts.
Which engines are compatible?
It is designed for compatible Small Block Chevy V8 engines from 265 to 400 CID. Verify your header's bolt requirements before ordering.
Do these bolts require separate washers?
No. The integrated flange design eliminates the need for separate washers.
Are these bolts suitable for block hugger headers?
Yes. The compact 5/16" hex heads help improve tool access in tight-clearance installations.
Is this a 16-piece kit?
No. This is a 12-piece set. Applications requiring 16 bolts need a separate compatible kit.
Need help confirming fitment? Contact us with your engine and header details before ordering.
