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35mm Replacement Intake Valve – For Honda GX390, Big Block Clones & 420cc Engines
35mm Intake Valve for Big Block Clone Wedge Heads
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35mm Replacement Intake Valve – For Honda GX390, Big Block Clones & 420cc Engines

Part Number: 188F-13001-A
Online Price: $8.99
35mm Intake Valve for Honda GX390 & 420cc Big Block Clone Engines
Availability: In Stock.

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Description

35mm Replacement Intake Valve – For Honda GX390, Big Block Clones & 420cc Engines


Restore airflow and performance with this OEM-style 35mm Intake Valve, designed to fit most Honda GX390, 420cc Predator, and big block clone engines. Ideal for stock or mild performance builds, this replacement valve features precise factory dimensions for reliable fit and function.


Manufactured with a 35mm (1.3775") head diameter and 6.5mm (.2565") valve stem, this intake valve is compatible with stock-style slip-on retainers. For high-RPM or racing applications, we strongly recommend upgrading to split lock keepers and retainers for improved valve control and long-term durability, which requires upgrading your valves.


Valve Specifications:

  • Head Diameter: 1.3775" (35mm)
  • Valve Stem Diameter: .2565" (6.5mm)
  • Overall Length: 3.3115" (84mm)
  • Retainer Style: Slip-on style (not split lock)


Key Features:

  • Direct replacement for GX390 and most 420cc clone engines
  • Stock-style valve for OEM heads or mild upgrade builds
  • Compatible with slip-on retainers (upgrade recommended for high-RPM use)
  • Ideal for kart racing, lawn equipment, and performance small engines
  • Precision-machined for durability and consistent airflow

FAQ

Q1: What engines is this intake valve compatible with?
A: This valve fits most Honda GX390, Predator 420, Ducar 420, and other big block clone engines with a 35mm intake valve setup.


Q2: What is the valve stem diameter?
A: The valve has a 6.5mm (.2565") stem diameter, which matches standard GX390 and clone valve guides.


Q3: Does this valve use split lock keepers?
A: No, it is designed for slip-on style retainers. For high-RPM or racing applications, it's strongly recommended to upgrade to split lock keepers and matching retainers for added security and durability.


Q4: Can I use this valve in a performance engine?
A: Yes, but for high-RPM or race builds, we recommend converting to split lock hardware and valves for improved valve control under stress.


Q5: Is this an OEM part?
A: This is a high-quality aftermarket replacement made to OEM specifications for fit, function, and reliability.

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