Exhaust Header
EXHAUST MANIFOLD HEADER FOR 55-57 SBC BEL AIR/NOMAD 150/210 BLOCK HUGGER TRI-5
A 1-3/4 inch T-304 stainless steel exhaust manifold header for the 1955-1957 Small Block Tri-5 Chevy engines with Bel Air, Nomad 150, and 210 block huggers. It replaces the factory cast iron manifolds with a 4-1 racing design and ships as a complete header system with all necessary installation hardware. Fitment is specific to the driver side of 1955-1957 SBC engines and does not fit with Edelbrock aluminum heads on the passenger side.
- MaterialT-304 Stainless Steel
- Design4-1 Racing Header
- FlangeCNC Machined
- WeldingTIG Double Side Welded
What You Get
Key Benefits
- 4-1 racing design improves exhaust flow and scavenging for immediate gains of 10 to 15 horsepower
- T-304 stainless steel resists rust and heat better than cast iron manifolds
- TIG double side welding ensures strong, leak-free joints under high engine temperatures
- CNC machined flanges provide a flat sealing surface for consistent gasket compression
- Complete header system includes all mounting hardware for direct bolt-on installation
Why Buyers Switch
Problems It Solves
- Factory cast iron manifolds restrict exhaust flow and limit power output
- Cast iron headers crack under heat cycling and fail after a few seasons
- Generic headers require custom welding and fitment work, increasing shop labour
- Edelbrock aluminum heads on the passenger side prevent use of standard headers
Where It Is Used
Application Scenarios
- Classic car restorers upgrading original Tri-5 Chevys with performance headers
- Performance shops installing bolt-on headers for vintage muscle car builds
- Distributors stocking vehicle-specific vintage exhaust parts for the 1955-1957 SBC market
- Online sellers needing a photographed, fitment-verified part for vintage Chevy listings
Buyers
Who It Is For
- Vintage performance parts distributors buying by the pallet for classic car markets
- Classic truck and car accessory wholesalers serving 1955-1957 Chevy owners
Construction
Technical Features
- 1-3/4 inch primary tubes with 4-1 racing header design
- T-304 stainless steel construction with TIG double side welding
- CNC machined flanges for precise fit and flat sealing surfaces
- Complete header system with all mounting hardware included
- Designed for driver side only on 1955-1957 SBC engines with original steering box
Data
Specifications
| Material | T-304 Stainless Steel |
|---|---|
| Design | 4-1 Racing Header |
| Flange | CNC Machined |
| Welding | TIG Double Side Welded |
| Package | 1x Header System with Hardware |
| Fitment | 1955-1957 Small Block Tri-5 Chevy (Bel Air, Nomad 150, 210 Block Hugger) |
| Exclusion | Does not fit passenger side with Edelbrock aluminum heads |
Material
Materials
- T-304 stainless steel tube
- CNC machined flange
- Installation hardware set
Manufacturing
How It Is Made
Tube bending to match original Tri-5 engine routing
CNC machining of flanges for flat sealing faces
TIG double side welding of flanges to tubes
Final fit check against engine block pattern before packing
Checks
Quality Control
- Flange bolt pattern and sealing face verified before welding
- Weld seams inspected for pinholes and gaps along the full joint
Private Label
Customisation Options
- Private label packaging and barcode labels on request
- Bulk cartons available for container orders instead of retail boxes
Comparison
Compared With The Alternatives
| Factory cast iron manifold | The stock manifold is heavier and restricts exhaust flow, this header improves flow and adds 10 to 15 horsepower |
|---|---|
| Mild steel aftermarket header | Mild steel costs less but rusts quickly at the flange; T-304 stainless resists corrosion and lasts longer |
| Universal header kit | A universal kit requires cutting and welding, this one bolts on directly with included hardware |
Installation
Use Guide
- Confirm the engine is a 1955-1957 Small Block Tri-5 with original steering box
- Ensure the passenger side does not have Edelbrock aluminum heads
- Remove the factory cast iron manifold and clean the engine block flange
- Install the new header using the included hardware and torque bolts evenly
- Use a new gasket at the manifold to block leaks; do not reuse the old one
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Answers
Questions About This Part
Will this fit a 1957 Chevy with Edelbrock aluminum heads?
No. This header is designed for the driver side only and will not fit if the passenger side uses Edelbrock aluminum heads.
What size are the primary tubes?
1-3/4 inch. The header uses 1-3/4 inch primary tubes with a 4-1 racing design.
Is the flange included or do I need to weld it on?
The CNC machined flange is already welded to the tube. The header ships as a complete unit.
What material is used and why does it matter?
T-304 stainless steel. It resists rust and heat better than cast iron or mild steel, ensuring longer life in vintage engine environments.
What is included in the package?
One complete header system with all necessary installation hardware. No gaskets or instructions are included.
Can we get our own brand on the box?
Yes. Private label packaging and barcode labels can be arranged, and bulk cartons are available for container orders.
Is this street legal in my state?
We make no emissions approval claim for this part. Check your local regulations before resale or installation.
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