Exhaust Parts · SKU 701807502185
EXHAUST HEADER MANIFOLD FLANGE CHEVY LONG TUBE HEADERS FLANGE,SBC,IMPALA,BEL AIR,CAMARO ADAPTOR 2PCS
A pair of 1-5/8 inch to 3 inch exhaust header flange adaptors for Chevrolet small block V8 engines in passenger cars from 1965 to 1989. Designed to connect long tube headers with 1-5/8 inch primaries to 3 inch collectors. Ships as a complete set with two 3 inch to 2-1/2 inch reducers for under-vehicle exhaust routing. Fitment is specific to 1964-1989 Chevrolet chassis with SBC engines and excludes 1967-1969 Camaro models with factory air conditioning.
- MaterialSteel
- Flange StyleRound Port
- Tube Outside Diameter1-5/8 inch
- Collector Size3 inch
What You Get
Key Benefits
- Connects 1-5/8 inch long tube headers to 3 inch collectors without custom welding
- Reduces exhaust back pressure by maintaining a smooth 3 inch flow path
- Two 3 inch to 2-1/2 inch reducers included for under-vehicle routing and clearance
- Round port flange design ensures consistent bolt pattern alignment with factory headers
- Steel flange construction resists warping under high exhaust temperatures
Why Buyers Switch
Problems It Solves
- Factory header flanges do not match 3 inch collectors on long tube setups, requiring custom fabrication
- Generic adaptors lack proper reducer length and cause exhaust clearance issues under the chassis
- Missing reducers force shops to source and weld separate components, increasing labour cost
- Incorrect flange alignment leads to leaks and poor sealing at the header joint
Where It Is Used
Application Scenarios
- Performance shops installing long tube headers on classic Chevys with 3 inch collectors
- Distributors stocking vehicle-specific adaptors for 1965-1989 Chevy models
- Restoration projects needing bolt-on header flange solutions for SBC engines
- Online sellers who need a clear fitment list and accurate product images for vintage parts
Buyers
Who It Is For
- Performance parts distributors buying classic Chevy exhaust hardware by the pallet
- Online auto parts sellers serving vintage Chevrolet owners in North America
Construction
Technical Features
- Pair of 1-5/8 inch to 3 inch round port flange adaptors with steel construction
- Includes two 3 inch to 2-1/2 inch reducers for under-vehicle routing
- Designed for 1964-1989 Chevrolet chassis with SBC engines
- Bolt-on fitment with no welding required
- Compatible with both automatic and manual transmissions
Data
Specifications
| Material | Steel |
|---|---|
| Flange Style | Round Port |
| Tube Outside Diameter | 1-5/8 inch |
| Collector Size | 3 inch |
| Reducers Included | 2x 3 inch to 2-1/2 inch |
| Fitment | 1965-1989 Chevrolet Bel Air, Biscayne, Caprice, Chevelle, El Camino, Impala, Malibu, Monte Carlo, Nova, Camaro (Excludes 1967-1969 with factory AC) |
| Exclusion | Does not fit 1967-1969 Camaro models with factory air conditioning |
| Package | 2x Flange Adaptors, 2x Reducers |
Material
Materials
- Steel flange
- Steel reducers
Manufacturing
How It Is Made
Cutting steel tubing to precise reducer lengths
Machining round port flanges to match factory header bolt patterns
Welding reducers to flanges with consistent joint alignment
Final inspection for weld integrity and dimensional accuracy
Packaging with flanges and reducers secured to prevent damage in transit
Checks
Quality Control
- Flange bolt pattern verified against factory header standards
- Weld seams inspected for gaps and uneven fusion
- Reducer length checked to ensure proper under-vehicle routing
- Final fit check using a sample header to confirm alignment
Private Label
Customisation Options
- Private label packaging available on request
- Bulk cartons for container orders instead of retail boxes
Comparison
Compared With The Alternatives
| Custom welded flange | A custom weld requires shop labour and takes time, this adaptor bolts on in minutes |
|---|---|
| Universal flange kit | Universal kits often lack proper reducer length and cause clearance issues under the chassis |
| Factory header flange | Factory flanges are not designed for 3 inch collectors and require modification |
Installation
Use Guide
- Confirm the vehicle is a 1965-1989 Chevrolet passenger car with SBC engine and not a 1967-1969 Camaro with factory air conditioning
- Verify header primaries are 1-5/8 inch before installing the adaptor
- Install reducers before connecting the header to the collector
- Torque flange bolts evenly in a crisscross pattern to prevent warping
- Check for exhaust leaks after the first heat cycle
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Answers
Questions About This Part
Does this fit a 1968 Camaro with factory air conditioning?
No. The part is not designed for 1967-1969 Camaro models with factory air conditioning.
What size are the header primaries and collectors?
The adaptors connect 1-5/8 inch header primaries to 3 inch collectors.
Are the reducers included or do I need to buy them separately?
Yes, two 3 inch to 2-1/2 inch reducers are included in the package.
Is the flange made of stainless steel or mild steel?
The flange is made of steel. No stainless steel or other alloy is specified.
What is included in the package?
Two flange adaptors and two 3 inch to 2-1/2 inch reducers.
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 legal for street use?
Emissions rules differ by market and we make no emissions approval claim for this part. Check your local regulations before resale.
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