High-Performance Long Tube Headers for 1977-1979 Ford F-350 4WD with 5.8L/6.6L V8 (351M/400M) - Improved Exhaust Flow & Horsepower - Perfect for Off-Roading, Towing & Performance Upgrades

Upgrade your 1977-1979 Ford F-350 (4WD) with Flashark Exhaust Headers designed for 351M and 400M engines (5.8L/6.6L). These headers improve exhaust flow, reduce back pressure, and boost horsepower for optimal engine performance.

Fitment:

• 1977-1979 Ford F-350 – 351M/400M 5.8L/6.6L 4WD?

Details:

Standard Uncoated Headers: 1-5/8 in.
Tube Dia: FULL-LENGTH Design
Primary Tube Diameter (in):1.625
Tubes Tube Diameter:1-5/8 in
Reducer Outlet Size: 2-1/2 In.
Collector Diameter: 3 In.
Collector Size: 3 In.

Specifications:

Brand Name: FLASHARK
Certificate: ISO9001:2000
Application: Automobile Exhaust Header
Surface: Mirror Polish
Model: EH28225
Material: Stainless Steel

Our black Exhaust Header features a high-quality black coating over durable stainless steel, specifically designed for 351M and 400M engines. This extra layer enhances the appearance while protecting the header from harsh driving conditions, ensuring long-lasting performance and reliability.

Features:

• Tuned-length primary tubes for maximum exhaust scavenging and velocity
  
• Mandrel-bent tubing for smooth exhaust flow
  
• Long transition collector for decreased back pressure
  
• 5/16 machined flanges for a perfect seal
  
• Industry?s best welds for durability
  
• Designed for optimal performance
  
• All necessary hardware included for a complete installation

Exhaust Headers vs. Manifold: Why Headers Are the Best Upgrade for Your 351M Engine

The key difference between? and manifolds is in both material and performance. Exhaust headers, made from lightweight, high-quality steel, are designed to optimize exhaust flow. Unlike thick iron manifolds, headers are longer and have individual tubes for each cylinder, which helps eliminate back pressure. This results in increased horsepower and improved efficiency, especially for 351M/400M engines.

Upgrading to Flashark Exhaust Headers will enhance engine performance and exhaust sound for your Ford Bronco or F-Series with a 351M/400M engine. Whether for daily driving or off-road adventures, these headers are engineered for maximum power with an easy, direct bolt-on installation—no modifications needed.

Why Choose Our Natural Stainless Steel Headers Over Black-Coated Alternatives?

While some competitors offer black-coated headers for a "stealth" look, our untreated stainless steel headers provide superior durability and long-term performance without compromises.

• No Peeling or Fading – Black coatings often chip, flake, or discolor under extreme heat, leaving a patchy, worn appearance. Our bare stainless steel maintains its integrity for years, resisting corrosion and wear.
  
• Better Heat Dissipation – Coatings can trap heat, reducing efficiency. Unpainted stainless steel allows optimal thermal transfer, helping your engine run cooler.
  
• Zero Maintenance – Unlike coated headers that require touch-ups, our stainless steel finish stays clean with minimal care—no worries about scratched paint or rust spots.
  
• Proven Material Quality – High-grade 304 stainless steel naturally resists oxidation, so it won’t degrade like cheap painted alternatives.

FAQ

Q: What is the primary tube diameter of these headers?

A: The primary tube diameter is 1-5/8 inches (1.625 inches). This size ensures smooth exhaust flow and improves performance, particularly for 351M/400M engines.

Q: Do these headers fit 4WD vehicles?

A: Yes, these Flashark Exhaust Headers are designed to fit 4WD models, including the 1977-1979 Ford Bronco, F100, F150, F250, and F350 with 351M/400M 5.8L/6.6L engines.

Q: Are these headers made of stainless steel?

A: Yes, these Flashark Exhaust Headers are made of 304 stainless steel and are coated for added durability. The coating enhances the aesthetic appeal while protecting the headers from harsh driving conditions.

Q: Do these headers fit 2WD models?

A: No, these headers are specifically designed for 4WD vehicles. They may not fit 2WD models like the 1978 F250 2WD with a 400 engine, as the chassis and exhaust configurations differ between 4WD and 2WD variants.