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EC Steel Exhaust Flange for Honda/Clone GX390-420-460
EC Steel Exhaust Flange for Honda/Clone GX390-420-460
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EC Steel Exhaust Flange for Honda/Clone GX390-420-460

Part Number: 1061
Online Price: $8.99
Steel Exhaust Header Flange – Fits 1.25” Pipe for Honda GX390 & Big Block Clones
Availability: In Stock.

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Description

1-1/4" Steel Exhaust Flange – For Honda GX390, Predator 420 & Big Block Clone Engines


Build a custom exhaust that performs and fits exactly how you need it with our 1-1/4" steel header flange, designed specifically for Honda GX390, Predator 420, and other big block clone engines. Perfect for DIY engine builders, racers, and fabricators, this exhaust flange provides a strong foundation for a custom header using standard 1.25" OD exhaust tubing.


Whether you're upgrading for performance, sound, or clearance, this precision-cut steel flange helps you get the most out of your exhaust setup.


Flange Specifications:

  • Inside Diameter: 1-1/4" – fits standard 1.25" OD exhaust tubing
  • Bolt Hole Diameter: 8.8mm (0.346")
  • Bolt Spacing: ~50mm (1.968") center-to-center
  • Thickness: ~0.240" for durability and easy welding
  • Material: Mild Steel – ideal for welding and high-temp environments


Compatible Engines:

  • Honda GX390
  • Clone engines, including Predator 420, Wildcat 460, and similar big block vertical/horizontal shaft engines
  • Commonly used in racing mowers, mud boats, mini bikes, go-karts, and small engine builds


Fitment Note:

While this flange fits most Honda/Clone big block engines, please verify your bolt spacing and port dimensions before ordering for best results.

FAQ

Q1: Will this flange fit the Predator 420 engine?
A: Yes, it fits most Predator 420 engines and other GX390-style clones. Always verify bolt spacing before purchasing.


Q2: What size exhaust pipe does this fit?
A: It is made to fit 1.25" OD exhaust pipe, which is a common size for custom performance headers.


Q3: Is the flange easy to weld?
A: Yes, it’s made from mild steel, which is strong, durable, and easy to weld with standard equipment.


Q4: Can I use this for a mini bike or go-kart build?
A: Absolutely. This flange is ideal for custom exhausts on racing mowers, mini bikes, go-karts, and other small engine applications.

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