AMC 360/390/401 V8 Custom Header Build Kit
Description
Product Description
Build your own custom performance headers for your AMC V8 with our Pro Series Header Build Kit designed for AMC 360, 390 and 401 Dog Leg-port cylinder heads. This complete kit includes precision-cut flanges, 304 stainless steel or mild steel mandrel bends, collectors, O2 bungs, and welding accessories—everything you need to fabricate a race-quality exhaust system in-house.
Key Features:
- Laser-cut 3/8″ thick 304 stainless or mild steel header flanges built specifically for AMC dog leg-port V8 heads.
- Choose from primary tube sizes: 1 3/4" or 1 7/8″ for optimized flow and torque characteristics.
- Includes (12) 180° mandrel J-bends with 6″ and 12″ legs for smooth routing and minimal trimming.
- Collector options include 4-into-1 formed weld-on collectors or slip-on merge collectors with straight or transitional exits.
- All components made in the USA from premium 304 stainless steel for unmatched durability and corrosion resistance, or mild steel for class rules or budget sensitive builds (will require a coating of some sort to prevent immediate corrosion).
This kit is ideal for custom fabricators, racers, or restoration builders looking for a tailored solution instead of an off-the-shelf header. It offers the flexibility to achieve perfect clearance and optimal flow for your specific AMC application.
Fitment Notes
Fitment Notes
- Engine compatibility: AMC 360, 390, 401 V8 engines with dog leg port heads.
- For use in street rods, muscle cars, off-road rigs, and racing applications.
- This is a build kit – fabrication and welding required.
- Ensure adequate clearance for chassis rails, steering components, and suspension arms.
- For maximum efficiency, match collector size and exit type to engine displacement and cam profile.
Technical Specs
Technical Specifications
| Specification | Detail |
|---|---|
| Material | 304 Stainless Steel or Mild Steel |
| Flange Thickness | 3/8″ (Precision Laser-Cut) |
| Primary Tube Sizes | 1 3/4" or 1 7/8" |
| J-Bends Included | 12 × 180° mandrel J-bends (6″ and 12″ legs) |
| Collector Options | 4-into-1 weld-on / Slip-on merge (straight or transitional) |
| O₂ Bungs | 2 × M18 weld-on bungs included |
| Purge Caps | 4 primary caps + 1 collector cap included |
| Finish | Raw tubing finish for fabrication or optional ceramic coating |
| Weight (approx.) | ~55 lbs (kit shipping weight-changes with tube size or kit additions) |
Installation
Installation & Notes
This is a fabrication kit and requires cutting, mock-up, and TIG or MIG welding to assemble. Follow these steps for best results:
- Mock up the header flanges on your AMC V8 heads and verify port alignment.
- Plan primary tube routing around steering, frame rails, and engine mounts.
- Cut and fit J-bends as needed, maintaining smooth radii for maximum flow.
- Back-purge during welding using included purge caps for strong, clean welds.
- Install O₂ bungs before final welding to allow for proper sensor placement.
- Check collector exit alignment and exhaust system clearance before final assembly.
Pro Tip: For best results, finish your headers with ceramic coating or thermal wrap to reduce engine bay heat and improve longevity.
Details
- SHM-5430-NA-HBK
- SHM-5430-NA-HBK
- Stainless Headers
- New
Shipping Information
- Item Requires Shipping
- 55.0 lbs.
- W19.0000” x H17.0000” x L19.0000”
- Free GROUND Shipping
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