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EC 315VS Tillotson HL-388A Billet Velocity Stack
315VS EC Infinite Radius Velocity Stack
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EC 315VS Tillotson HL-388A Billet Velocity Stack

Part Number: 315VS
Online Price: $24.99
EC 315VS Billet Velocity Stack for Tillotson HL-388A – 2.5" OD
Availability: In Stock.

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Description

EC 315VS Billet Velocity Stack for Tillotson HL-388A – 2.5" OD, CNC Machined Aluminum


Unlock maximum airflow and carb signal with the EC 315VS Velocity Stack, engineered specifically for the Tillotson HL-388A carburetor. This velocity stack is designed to improve air velocity and flow, delivering superior throttle response and performance where every horsepower counts.


As the original innovators of the infinite-radius design for Tillotson carbs—now commonly imitated by other manufacturers—EC Velocity Stacks set the standard for high-efficiency intake performance. When rules allow, velocity stacks are a clear upgrade over basic filter adapters.


Each 315VS is CNC machined from 6061-T6 billet aluminum for unmatched strength, precision, and durability. It includes all the necessary hardware for a straightforward, secure installation.


Key Features:

  • Precision Flow Design: Infinite-radius venturi enhances airflow and improves carburetor signal
  • Optimized for Racing: Best used in performance applications where velocity stacks are permitted
  • Durable Construction: CNC machined from aircraft-grade 6061-T6 billet aluminum
  • Complete Kit: Includes all hardware for installation
  • Made by the Original Innovators: EC designed the first infinite-radius venturi for Tillotson carbs


Fitment Details:

  • Fits: Tillotson HL-388A Carburetor
  • Outer Diameter (OD): Approx. 2.5"
  • Inner Diameter (ID): Approx. 1.186"
  • Bolt Spacing: 1.750", uses 10-32 thread bolts
  • Filter Compatibility: Check your air filter to ensure proper fitment


Why Use a Velocity Stack Over a Filter Adapter?

Velocity stacks create a smoother and more efficient air path into the carburetor, significantly improving performance. In classes where they are permitted, we strongly recommend using a velocity stack for optimal engine response and airflow.

FAQ

1. What does the EC 315VS Velocity Stack do?

It enhances the air velocity and improves the fuel signal entering the Tillotson HL-388A carburetor, resulting in better engine performance and throttle response.


2. What is the “infinite-radius venturi”?

It’s a design innovation by EC that smooths airflow transitions, reducing turbulence and improving flow consistency into the carburetor—now widely copied by others.


3. What carburetors is it compatible with?

It’s designed to fit the Tillotson HL-388A and may also fit other HL-series carbs with matching dimensions. Always check your fitment specs.


4. What air filter size does this fit?

It features a 2.5" outside diameter, compatible with most standard performance air filters used in karting and small-engine racing.


5. What are the dimensions and hardware specs?

  • OD: ~2.5"
  • ID: ~1.186"
  • Bolt spacing: 1.750"
  • Mounting threads: 10-32
    Includes all necessary mounting hardware.


6. Is this legal for racing?

Yes, in most classes that allow velocity stacks. Check your specific rulebook before ordering to ensure compliance with your class regulations.

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