Exhaust Parts · SKU 701807502161
HEADER EXHAUST MANIFOLD FLANGE FOR 330/360/390 FORD BIG BLOCK FE ADAPTOR 2PCS
A pair of 1-3/4 inch stainless steel flanges for the 330, 360, and 390 Ford Big Block FE shorty headers. Designed as an adaptor to connect headers to exhaust manifolds. Ships as two flanges with no bolts or gasket included. Constructed from 3/8 inch thick stainless steel with CNC mandrel bent pipes for consistent flow. Fitment is specific to the Ford Big Block FE engine family and requires professional installation.
- MaterialStainless Steel
- Flange Thickness3/8 inch
- Primary Tube Size1-3/4 inch
- Quantity2 pcs
What You Get
Key Benefits
- 3/8 inch thick flanges provide structural rigidity and resist warping under high heat and pressure
- CNC mandrel bent pipes maintain consistent bore size for improved exhaust flow
- 1-3/4 inch primary tubes allow for higher flow capacity than stock manifolds
- Stainless steel construction resists rust and heat degradation over time
- Pair of flanges enables direct bolt-on connection between header and manifold without custom welding
Why Buyers Switch
Problems It Solves
- Factory manifolds restrict exhaust flow and limit engine breathing on high-performance builds
- Mild steel adaptors warp or crack under repeated heat cycles and fail prematurely
- Poorly fitted flanges leak at the joint and cause backpressure and noise issues
- Generic flanges require cutting and welding, which increases shop labour and risk of misalignment
Where It Is Used
Application Scenarios
- Performance shops upgrading vintage Ford Big Block FE engines with improved exhaust flow
- Distributors stocking hard parts for classic Ford truck and muscle car restorations
- Restoration builders replacing corroded or damaged factory manifolds with durable stainless adaptors
- Online sellers needing a vehicle-specific exhaust adaptor with clear fitment and technical details
Buyers
Who It Is For
- Performance parts distributors buying classic Ford exhaust adaptors by the pallet
- Truck accessory wholesalers serving vintage Ford truck owners and collectors
Construction
Technical Features
- Pair of 1-3/4 inch stainless steel flanges for Ford Big Block FE shorty headers
- 3/8 inch thick flange material for durability and flatness under load
- CNC mandrel bent pipes for consistent internal diameter and smooth flow
- No bolts or gasket included - requires user-supplied fasteners and sealing components
- Designed to connect headers to exhaust manifolds on 330, 360, and 390 Ford Big Block FE engines
Data
Specifications
| Material | Stainless Steel |
|---|---|
| Flange Thickness | 3/8 inch |
| Primary Tube Size | 1-3/4 inch |
| Quantity | 2 pcs |
| Included | Flanges only - no bolts or gasket |
| Fitment | 330, 360, 390 Ford Big Block FE engines |
| Construction | CNC Mandrel Bent Pipes |
Material
Materials
- Stainless steel flange
- CNC mandrel bent stainless steel pipe
Manufacturing
How It Is Made
Cutting stainless steel tubing to length for 1-3/4 inch primary tubes
Machining flanges to 3/8 inch thickness with precise bolt hole patterns
CNC mandrel bending of pipes to maintain consistent bore and curvature
Final inspection of welds and flange flatness before packaging
Checks
Quality Control
- Flange bolt hole pattern verified against engineering drawing before welding
- Weld seams inspected for pinholes and incomplete fusion along the full joint
- Flange sealing face checked for flatness and surface defects before packing
Private Label
Customisation Options
- Private label packaging and barcode labels on request
- Bulk cartons available for container orders instead of individual retail boxes
Comparison
Compared With The Alternatives
| Factory Ford Big Block FE manifold | The stock manifold restricts flow with narrow passages and sharp bends; this adaptor enables larger 1-3/4 inch tubes for better exhaust evacuation |
|---|---|
| Mild steel flange adaptor | Mild steel deforms under heat and rusts at the flange; stainless steel holds shape and resists corrosion over time |
| Universal flange kit | Universal kits require cutting and welding; this one ships as a pre-fitted pair with no modification needed |
Installation
Use Guide
- Confirm the engine is a 330, 360, or 390 Ford Big Block FE before ordering
- Inspect flanges for damage or warping before installation
- Use a new gasket and proper torque sequence to avoid leaks
- Ensure all bolts are tightened to manufacturer's specifications
- Do not reuse old gaskets or bolts; they may not seal properly under high heat
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Answers
Questions About This Part
Does this include bolts and gaskets?
No. The flanges are sold as a pair without bolts or gaskets. You must supply your own fasteners and sealing components.
What engine models does this fit?
This adaptor fits 330, 360, and 390 cubic inch Ford Big Block FE engines. It is not compatible with small block or later engine families.
Is this a one-piece header or just flanges?
This is a pair of flanges only. It is not a complete header. It connects to your existing shorty header and manifold.
What is the thickness of the flange?
The flange is 3/8 inch thick, providing extra strength and resistance to warping under heat and pressure.
Can I install this myself?
Professional installation is highly recommended. Proper alignment and torque are critical to prevent leaks and engine damage.
Is this compatible with a 428 or 429 engine?
No. This adaptor is designed specifically for 330, 360, and 390 Ford Big Block FE engines. It does not fit 428 or 429 engines.
Can I get private label packaging?
Yes. Private label packaging and barcode labels can be arranged. Bulk cartons are available for container orders.
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