Exhaust Parts · SKU 701807502208
LS1 LS2 LS3 LS6 Conversion Swap Headers Flange Camaro, Chevelle, Nova, Firebird
A pair of 1 5/8 inch primary tube stainless steel header flanges for LS1 LS2 LS3 LS6 Chevrolet engine swap applications in 1965-1976 Bel Air, Camaro, Chevelle, Nova, and Firebird models. Designed for vehicles with a center crossmember under the engine, it enables a direct bolt-on fit for LS engines into older chassis. The flanges are CNC mandrel bent and include two flanges with no bolts or gaskets. Fitment is specific to the listed models and years.
- MaterialStainless Steel
- Size1 5/8 inch primary tubes
- Flange Thickness3/8 inch
- Package2 x Flanges
What You Get
Key Benefits
- 1 5/8 inch primary tubes with CNC mandrel bending for consistent flow and no restriction
- Stainless steel construction resists rust and heat cycling better than mild steel
- Pair of flanges included for a complete swap setup without needing to source separately
- CNC machined flanges ensure flat sealing surfaces for leak-free joint performance
- Designed for vehicles with a center crossmember, matching factory mounting points
Why Buyers Switch
Problems It Solves
- Factory exhaust manifolds on 1965-1976 Chevrolets restrict flow and limit LS engine performance
- Mild steel flanges rust at the bolted joint, especially in humid or salty environments
- Generic universal flanges require cutting and welding, increasing shop labour time
- Missing or mismatched flanges delay engine swap projects and cause fitment issues
Where It Is Used
Application Scenarios
- Performance shops installing LS engines into classic muscle cars with factory crossmembers
- Distributors stocking engine swap hardware for 1965-1976 Chevrolet platforms
- Restoration shops upgrading old V8s with modern LS powerplants and clean exhaust routing
- Online sellers needing a vehicle-specific, photographed part with a clear fitment list
Buyers
Who It Is For
- Performance parts distributors buying engine swap hardware by the pallet
- Online auto parts sellers serving the LS swap market for older Chevrolets
Construction
Technical Features
- Pair of 1 5/8 inch primary tube header flanges for LS1 LS2 LS3 LS6 engine swap
- CNC mandrel bent pipes for consistent internal diameter and smooth flow
- Stainless steel flanges with flat sealing faces for reliable gasket sealing
- Designed for vehicles with a center crossmember under the engine
- No bolts or gaskets included; use with new hardware and gaskets for proper sealing
Data
Specifications
| Material | Stainless Steel |
|---|---|
| Size | 1 5/8 inch primary tubes |
| Flange Thickness | 3/8 inch |
| Package | 2 x Flanges |
| Exclusion | Does not fit vehicles without a center crossmember under the engine |
Material
Materials
- Stainless steel tube
- CNC machined flange
Manufacturing
How It Is Made
Tube bending to match factory header routing for LS engine swap
Flange machining on CNC for flat sealing face and precise bolt hole alignment
Final inspection against fitment pattern before packing
Checks
Quality Control
- Flange bolt pattern and hole alignment checked before welding
- Weld seams inspected for pinholes and uniformity along the full joint
Private Label
Customisation Options
- Private label packaging and barcode labels on request
- Bulk cartons available for container orders instead of individual boxes
Comparison
Compared With The Alternatives
| Factory exhaust manifolds on 1965-1976 Chevrolets | Factory manifolds restrict exhaust flow and limit LS engine performance; these flanges open the system for better breathing |
|---|---|
| Mild steel flanges from other suppliers | Mild steel rusts at the flange joint over time; stainless steel holds up through repeated heat cycles and road exposure |
| Universal flanges requiring cutting and welding | Universal flanges need shop time to fit; these are pre-fitted and bolt-on with no modification |
Installation
Use Guide
- Confirm the vehicle is a 1965-1976 Bel Air, Camaro, Chevelle, Nova, or Firebird with a center crossmember
- Remove the factory exhaust manifold before installing the new flanges
- Use new gaskets and bolts for a proper seal; do not reuse old components
- Torque flange bolts evenly in a cross pattern to maintain sealing face flatness
- Recheck torque after the first heat cycle to prevent leaks
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Answers
Questions About This Part
Will this fit a 1970 Chevelle with a factory crossmember?
Yes. The flanges are designed for 1965-1976 Chevrolets with a center crossmember under the engine, including the 1970 Chevelle.
What size are the primary tubes?
1 5/8 inch. These are standard for LS engine swap applications in classic Chevrolets.
Are bolts and gaskets included?
No. The package includes only two flanges. Bolts and gaskets are not included and must be sourced separately.
Is this flange compatible with LS1 LS2 LS3 LS6 engines?
Yes. The flanges are designed specifically for LS1, LS2, LS3, and LS6 engines in 1965-1976 Chevrolet platforms.
Can I use this on a vehicle without a center crossmember?
No. The flanges are designed for vehicles with a center crossmember under the engine. They will not fit properly on models without one.
Do you offer bulk pricing or private label packaging?
Yes. Private label packaging and barcode labels can be arranged, and bulk cartons are available for container orders.
Is this part street legal in my country?
We make no emissions approval claim for this part. Check your local regulations before resale or installation.
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