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EC 458INT Long Billet Intake – GX390 Carb to GX200 Head
458INT EC Intake Manifold GX390/420 Carburetor to GX200 Honda/Clone/Predator
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EC 458INT Long Billet Intake – GX390 Carb to GX200 Head

Part Number: 458INT
Online Price: $48.99
EC 458INT Long Billet Intake – GX390 Carb to GX200 Head
Availability: In Stock.

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Description

EC 458INT Billet Intake Manifold – GX390 Carb to GX200/Clone Head


Precision Long-Runner Intake for Big-Block Carbs on Small-Block Heads


The EC 458INT Billet Intake Manifold is engineered to adapt a stock GX390 or 420-style carburetor to a Honda GX200 or clone (small-block) cylinder head. Unlike generic short intakes on the market, the 458INT is purpose-built with an extended runner length that mirrors the geometry used on our performance Tillotson carburetors—offering a more optimized intake track for torque and drivability.


Perfect for racers and engine builders looking to run a GX390 carb on a GX200-style head without sacrificing flow quality or fitment.


Key Features:

  • Fits GX390/420 (big block) carburetors to GX200/Clone heads
  • "Long" intake runner design for improved throttle response and airflow
  • CNC-machined billet aluminum for precision, strength, and heat resistance
  • Port-matched to closely follow the unique shape of most GX200/Clone intake ports
  • Designed to promote laminar flow and reduce turbulence or misalignment


Short vs. Long Intake Options:

Want a tighter, more compact fit? Check out our short version, the EC 474INT Intake Manifold, made for the same carb-to-head conversion in more confined engine bays.


Comparison: EC 458INT vs. EC 474INT Intake Manifolds

Feature

EC 458INT (Long Intake)

EC 474INT (Short Intake)

Carb Compatibility

GX390 / GX420

GX390 / GX420

Head Compatibility

GX200 / Clone

GX200 / Clone

Intake Runner Length

Long (mimics Tillotson runner length)

Short (compact fit)

Torque Optimization

Better for low/mid RPM torque

Better for high RPM response or tight fit

CNC Port Matching

Yes

Yes

Best For

Torque builds, open space configurations

Space-limited builds, high-RPM use cases


Why It Matters:

Generic manifolds often ignore the importance of port alignment and runner length. The EC 458INT is specifically engineered to reduce turbulence at the cylinder head entry, preserving the velocity of the intake charge and improving overall engine efficiency—especially at low to mid RPMs where torque matters most.


Port Shape Compatibility Note:

This intake is CNC matched to the common GX200/Clone port profile, but head castings can vary by brand or model. Minor hand-porting may be required for perfect alignment on certain aftermarket heads.

FAQ

1. What engines and carburetors does the 458INT fit?

This manifold is designed to adapt GX390 or 420-style carburetors (big-block) to a Honda GX200 or Clone-style cylinder head (small-block).


2. Why use a long intake runner?

Longer intake runners can improve torque and throttle response at low and mid RPM ranges. The 458INT mimics the runner length used on Tillotson setups, improving airflow velocity and engine drivability.


3. Is this intake port-matched?

Yes, the flange is CNC-machined to closely match the GX200/Clone port profile, reducing misalignment and minimizing turbulence. Some aftermarket heads may require slight hand-fitting for a perfect match.


4. Is there a shorter version of this intake?

Yes! For more compact setups, see our EC 474INT Short Intake, which performs the same carb-to-head conversion in a tighter space.


5. What material is the intake made from?

The 458INT is made from CNC-machined billet aluminum, ensuring strength, durability, and excellent heat resistance for high-performance applications.

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