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  5. EC 440INT Intake Manifold Red Spec HL-357 to Briggs Raptor
EC 440INT Intake Manifold Red Spec HL-357 to Briggs Raptor
440INT EC Intake Manifold Red Spec HL-357 to Briggs Raptor
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EC 440INT Intake Manifold Red Spec HL-357 to Briggs Raptor

Part Number: 440INT
Online Price: $48.99
EC 440INT Intake – HL-357 Tillotson to Briggs Raptor Flathead
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Description

EC 440INT Billet Intake Manifold – Fits HL-357 Tillotson to Briggs Raptor Flathead (Model 13)


Purpose-Built for Spec 4-Cycle Racing Performance


The EC 440INT Intake Manifold is engineered to adapt the Tillotson HL-357A methanol carburetor to the Briggs Raptor (Model 13) flathead engine. This intake was specifically designed to maintain factory-level airflow for spec-class competition, ensuring performance parity and reliability.


Paired with EC’s HL-357A carburetor—originally developed as a methanol-ready stock replacement—this manifold supports engines where stock fuel tank issues and vibration have historically led to cracking and carburetor damage.


Finished in signature red anodizing, the 440INT is a true spec-legal billet intake, designed to prevent airflow gains through modifications. It reflects EC’s commitment to performance standardization—paving the way for some of karting’s earliest spec 4-cycle classes.


CNC-Machined for Precision and Consistency

Each 440INT is CNC-machined from billet aluminum to perfectly match the Briggs Raptor intake port geometry, ensuring:

  • No turbulence or port misalignment
  • Smooth, laminar airflow from carb to valve
  • Stronger vacuum pulse for reliable diaphragm operation
  • Optimal fuel atomization and throttle response

The manifold's precisely located pulse hole ensures the HL-357’s diaphragm receives the signal it needs to deliver fuel consistently—even under high-RPM racing conditions.


About Intake Length & Pulse Signal

If you’re considering longer intakes for tuning, keep this in mind:

  • Tillotson diaphragm carbs rely on a strong, direct vacuum pulse.
  • Longer intake runners reduce that signal strength, making tuning less precise.
  • Intake tuning is a balance of multiple variables: cam timing, carb size, valve lift, and port shape.

The EC 440INT is engineered to deliver the ideal runner length and angle, providing maximum carburetor performance and throttle response without sacrificing signal integrity.


What’s Included:

  • EC 440INT Billet Intake Manifold (Red anodized)
  • Pulse fitting
  • Complete mounting hardware


Compatibility:

Carburetors:

  • Tillotson HL-357A (and similar sized Tillotson HL methanol setups)

Engines:

  • Briggs Raptor (Model 13) Flathead

Not compatible with other cylinder head configurations or modified intake ports.


FAQ

Q1: What carburetors is the EC 440INT compatible with?

A: It is specifically designed for the Tillotson HL-357A and compatible HL-357 methanol carburetors.


Q2: Which engines does the 440INT fit?

A: The 440INT fits the Briggs Raptor (Model 13) flathead engine. It is designed for use in spec or limited modified flathead kart classes.


Q3: Is this intake legal for all racing classes?

A: No, the EC 440INT is designed to maintain stock-level airflow for spec racing. Always check your series rulebook to ensure compatibility.


Q4: What’s special about the red anodizing?

A: The red anodized finish is EC’s signature color for spec-legal intakes. It also offers added corrosion resistance and visual identification in tech inspections.


Q5: Can I use a different HL-series carb with this manifold?

A: While it's optimized for the HL-357, other HL carburetors with similar geometry may fit. However, fitment and tuning results may vary outside of the HL-357.


Q6: Does intake runner length affect performance with HL carbs?

A: Yes. Diaphragm carbs like the HL-357 require a strong vacuum signal from the intake. Overly long runners reduce that signal and can hinder performance. The 440INT is engineered to balance airflow and pulse signal for optimal performance.

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