Exhaust Header
EXHAUST HEADER FOR UP&FORWARD HEADER FOR CHEVY BIG BLOCK BBC 396/427/454/507/572
A 2-piece 4-1 racing exhaust header set for Chevrolet Big Block BBC 396, 427, 454, 507, and 572 engines with a forward/top mount configuration. Built from T-304 stainless steel with computerized mandrel bends and TIG double-side welded CNC machined flanges. Ships with left and right headers, V-band flanges, V-band clamps, and manifold bolts and gaskets. Designed for high exhaust flow and durability under performance use.
- MaterialT-304 Stainless Steel
- ConstructionTIG Double Side Welded
- FlangeCNC Machined, V-band
- Inlet Size2.25 inch
What You Get
Key Benefits
- 2-piece 4-1 (8-2-1) design improves exhaust scavenging and engine breathing at high RPM
- T-304 stainless steel resists heat and corrosion better than mild steel or cast iron
- Computerized mandrel bends maintain consistent internal diameter for smooth exhaust flow
- CNC machined flanges ensure flat sealing faces to prevent leaks under high pressure
- V-band clamps and flanges allow quick disassembly for maintenance or tuning
- 3.4 inch internal diameter outlet matches common turbo inlet sizes for easy upgrade
Why Buyers Switch
Problems It Solves
- Factory manifolds restrict exhaust flow and reduce high-end power output
- Mild steel headers warp or crack under repeated heat cycling and high exhaust temperatures
- Cast iron manifolds are heavy and prone to cracking at the flange or port
- Poorly fitted flanges leak at the header-to-manifold joint, causing noise and power loss
- Universal headers require cutting, welding, and custom fitting, which increases shop labour time
Where It Is Used
Application Scenarios
- Performance shops building high-output big block engines for drag racing or show vehicles
- Distributors stocking vehicle-specific headers for classic Chevy muscle car restorations
- Tuning shops upgrading old BBC engines with improved exhaust flow and reduced back pressure
- Online sellers needing a photographed, fitment-verified header with a clean part number
Buyers
Who It Is For
- Performance parts distributors buying big block exhaust hardware by the pallet
- Diesel and truck accessory wholesalers serving muscle car and hot rod enthusiasts
Construction
Technical Features
- 2-piece 4-1 (8-2-1) racing header design with forward/top mount configuration
- T-304 stainless steel tubing with computerized mandrel bends for consistent bore
- TIG double-side welded joints for strength and leak resistance
- CNC machined flanges with 2.25 inch inlet and 3.4 inch outlet diameter
- V-band flanges and clamps included for quick assembly and disassembly
- Manifold bolts and gaskets included with each header pair
Data
Specifications
| Material | T-304 Stainless Steel |
|---|---|
| Construction | TIG Double Side Welded |
| Flange | CNC Machined, V-band |
| Inlet Size | 2.25 inch |
| Outlet Size | 3.4 inch |
| Design | 2-Piece 4-1 (8-2-1) Racing |
| Configuration | Forward / Top Mount |
| Package | Pair of Headers, V-band Flanges, Clamps, Bolts, Gaskets |
| Fitment | Chevrolet Big Block BBC 396, 427, 454, 507, 572 |
| Exclusion | Not for engines outside the listed BBC models |
Material
Materials
- T-304 stainless steel tubing
- CNC machined V-band flanges
- V-band clamps
- Manifold bolts and gaskets
Manufacturing
How It Is Made
Tube bending using computerized mandrel benders to maintain internal diameter
CNC machining of flanges for flat sealing faces and precise bolt hole alignment
TIG welding of flanges to tubes with double-side seam for strength
Final inspection of weld seams and flange flatness before packaging
Assembly of V-band flanges, clamps, bolts, and gaskets for shipping
Checks
Quality Control
- Flange sealing face checked for flatness and surface defects before welding
- Weld seams inspected under magnification for pinholes and incomplete fusion
- V-band flanges tested for proper fit with clamps and alignment
- Final fit check against a sample engine block before packing
Private Label
Customisation Options
- Private label packaging and barcode labels available on request
- Bulk cartons provided for container shipments instead of individual retail boxes
Comparison
Compared With The Alternatives
| Factory cast iron manifolds | Cast iron is heavier and cracks under heat stress; this header is lighter and more durable |
|---|---|
| Mild steel headers | Mild steel warps and rusts faster; T-304 stainless resists heat and corrosion over time |
| Universal headers | Universal headers require cutting and welding; this one bolts on with included hardware |
Installation
Use Guide
- Confirm the engine is a Chevrolet Big Block BBC 396, 427, 454, 507, or 572
- Remove the factory manifolds and clean all mating surfaces before installation
- Install new gaskets and bolts-do not reuse old ones
- Use the V-band clamps to secure the headers to the engine and turbo
- Torque bolts in a crisscross pattern to prevent warping and leaks
- Recheck all connections after the first heat cycle
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Answers
Questions About This Part
Does this fit a 1970 Chevelle SS with a 454 engine?
Yes. The part covers Chevrolet Big Block BBC 396, 427, 454, 507, and 572 engines with a forward/top mount configuration.
What size are the inlet and outlet ports?
Inlet is 2.25 inch, outlet is 3.4 inch. The 3.4 inch outlet matches common turbo inlet sizes.
Are the V-band clamps included?
Yes. The package includes two V-band flanges, two V-band clamps, and all necessary bolts and gaskets.
Is this a bolt-on replacement or does it require welding?
It is a bolt-on replacement. All flanges are pre-fitted and secured with V-band clamps.
What material is used and why is it better?
T-304 stainless steel is used for its high heat resistance, corrosion resistance, and durability under repeated thermal cycling.
Can I get this with a different flange size?
The standard outlet is 3.4 inch. Custom flange sizes are not offered, but the 3.5 inch V-band flanges allow compatibility with many turbo systems.
Is professional installation required?
Yes. Professional installation is highly recommended due to the precision fit and high-performance nature of the header.
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