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EC 409INT Intake Manifold 1.125 HL to Tecumseh 10Hp
409INT EC Intake Manifold 1.125" HL to Tecumseh 10Hp
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EC 409INT Intake Manifold 1.125 HL to Tecumseh 10Hp

Part Number: 409INT
Online Price: $24.99
EC 409INT Billet Intake Manifold – 1.125” HL to Tecumseh Star
Availability: In Stock.

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Description

EC 409INT Billet Intake Manifold – 1.125” HL Carb to Tecumseh Star (Flathead)


Race-Engineered Intake for Open Tecumseh Flathead Engines


The EC 409INT Billet Intake Manifold is purpose-built to adapt 1.125” Tillotson HL-series carburetors, including the race-dominating EC X380 Intimidator, to the Tecumseh Star flathead engine. Precision CNC-machined and race-tested, this manifold is optimized for open-class flathead applications where performance, airflow, and throttle response are critical.


Not WKA Legal – Please verify class rules before ordering.


Recommended Setup: EC X380-3 Intimidator Carb

For peak performance, we recommend pairing the 409INT with our EC X380-3 Intimidator, the winningest 1.125” carb in open flathead racing. It’s designed specifically for:

  • Methanol fuel use
  • Flathead tuning geometry
  • Maximum throttle response and high-RPM consistency


Precision-Crafted for Race Performance

Each 409INT manifold is CNC-machined from billet aluminum to perfectly match the Tecumseh Star intake port shape (port shape may vary slightly by head model). The result:

  • Seamless port transition
  • Laminar, turbulence-free airflow
  • Stronger vacuum signal at high RPM
  • Ideal angle through the intake tract for optimized atomization

A strategically placed pulse port ensures consistent fuel pump operation from the carb’s diaphragm, even under extreme race conditions.


Understanding Intake Runner Length

Thinking of experimenting with runner length? Here’s what to consider:

  • Tillotson HL carbs depend on strong vacuum pulses to operate correctly.
  • Longer intakes weaken signal strength, reducing tuning consistency and fuel delivery at high RPM.
  • True intake tuning depends on a combination of port design, cam timing, valve size, and carburetor selection—not just added length.

The 409INT strikes the ideal balance between flow velocity and pulse strength, offering race-ready performance right out of the box without the guesswork.


What’s Included:

  • EC 409INT Billet Intake Manifold
  • Complete mounting hardware


Compatibility:

Carburetors:

  • 1.125” Tillotson HL-Series (e.g., HL-380, HL-380A/B)
  • EC X380 Intimidator Series (recommended: X380-3)

Engine Platform:

  • Tecumseh Star (Open Raptor-style flathead racing engines)


Tech Note:

This intake is designed for high-performance racing applications. Not legal for WKA-sanctioned events. Always consult your rulebook.

FAQ

Q1: What carburetors are compatible with the EC 409INT?

A: This manifold is designed for 1.125” Tillotson HL-series carburetors, including the HL-380 variants and the high-performance EC X380 Intimidator Series, especially the X380-3.


Q2: What engines does this intake fit?

A: The EC 409INT is engineered to fit the Tecumseh Star flathead engine, commonly used in open-class kart racing.


Q3: Is the EC 409INT WKA legal?

A: No, this intake manifold is not WKA legal. Always check your racing series rulebook before purchasing or installing.


Q4: Why is intake runner length important for this setup?

A: Tillotson diaphragm-style carbs require a strong vacuum signal to function properly. A longer intake runner may weaken this signal, hurting fuel delivery and tuning consistency. The 409INT is designed to maintain strong signal while maximizing airflow.


Q5: Does this come with everything I need for installation?

A: Yes. The EC 409INT includes:

  • CNC-machined billet intake
  • Complete mounting hardware

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