Description
Product Overview
Mr Gasket presents a premium 16‑piece stainless steel header bolt kit engineered for demanding automotive exhaust systems. Each bolt measures 3/8‑16 thread size with a 0.750‑inch long coarse thread, conforming to Grade 8 specifications and a 3A/3B thread class for maximum tensile and shear strength. Constructed from corrosion‑resistant stainless steel with a machined exterior finish, the bolts feature a hex head and a uniquely sized washer face that slides into confined header bolt holes where standard heads cannot reach. With a maximum shear strength of 275 MPa, these fasteners are designed to endure the extreme temperatures and vibration of performance exhausts.
Usage
These header bolts are perfect for rebuilding or upgrading the exhaust manifolds of big‑block Chevrolet, Ford and Buick engines. Whether you are installing a new performance header, repairing a cracked exhaust manifold, or replacing worn bolts on a classic vehicle, the reduced washer face provides the clearance needed for tight‑fit applications. The stainless steel construction ensures longevity in the harsh under‑hood environment, making them suitable for both street and track use.
Why Choose Us
Mr Gasket combines decades of fastener engineering expertise with rigorous quality control. Each bolt undergoes precision machining and heat treatment to meet Grade 8 standards, guaranteeing consistent torque values and resistance to stretch. The stainless steel alloy offers superior corrosion resistance compared to standard carbon steel, reducing the need for frequent replacements. Our bolts are backed by a manufacturer warranty, providing confidence for professional mechanics and DIY enthusiasts alike.
Key Features
- Stainless steel construction with machined finish for corrosion resistance
- Reduced washer face design fits tight header bolt holes
- Grade 8, 3A/3B thread class delivers 275 MPa shear strength
- 3/8‑16 x 3/4 inch coarse threads suitable for high‑temperature exhausts
- Complete 16‑piece kit ensures you have the right size for every bolt location
FAQ
Are these bolts compatible with all exhaust headers?
The bolts are designed for big‑block Chevrolet, Ford and Buick applications. They fit most standard 3/8‑16 header bolt patterns, but always verify the thread pitch and length against your specific header.
Can I use these bolts on a street‑driven vehicle?
Yes. The stainless steel material and high shear strength make them suitable for daily driving as well as high‑performance track use.
Do I need a torque wrench for installation?
We recommend using a torque wrench set to the manufacturer’s specification (typically 70‑80 lb‑ft) to ensure proper clamping force and prevent over‑tightening.
What warranty does Mr Gasket provide?
All bolts come with a limited warranty against material defects for the life of the product when used as intended.
How do I store the bolts to maintain their quality?
Keep the bolts in a dry, corrosion‑free environment, preferably in the original packaging, to preserve the stainless steel finish until installation.
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