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6mm Bronze Valve Guides for Honda GX390, Predator 420, Wildcat 460
6mm Valve Guide for GX390/420 Heads
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6mm Bronze Valve Guides for Honda GX390, Predator 420, Wildcat 460

Part Number: 188F-11204-B
Online Price: $9.95
GX390 / Predator 420 Bronze Valve Guides – 6mm or 6.5mm Compatible
Availability: In Stock.

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Description

Bronze Valve Guides for Honda GX390 / Predator 420 / Big Block Clone Engines – 6mm Conversion


Upgrade your cylinder head for high-performance builds with these precision aftermarket bronze valve guides, designed for Honda GX390, Predator 420, Wildcat 460, and other Big Block Clone engines.


These guides are ideal for converting Wedge (Non-Hemi) heads from 6.5mm valve stems to 6mm valve stems, commonly used in racing applications for improved airflow and lighter valvetrain weight. For those staying with standard valves, they can also be reamed or honed back to 6.5mm for a precise OEM-style fit.


Product Specifications:

  • Inner Diameter: 5.95mm / 0.234" (for 6mm stem valves)
  • Outer Diameter: 12.06mm / 0.475"
  • Overall Length: 33mm / 1.300"
  • Seal Groove: Yes – compatible with OEM-style valve stem seals
  • Material: High-quality bronze alloy for superior wear resistance and heat dissipation


Key Features:

  • 6mm Conversion: Ideal for high-RPM race builds that use 6mm valve stems
  • Modifiable: Can be precision reamed to 6.5mm for OEM valve compatibility
  • High Performance: Bronze construction improves durability, reduces friction, and withstands higher temperatures
  • Drop-In Fit for Wedge Heads: Designed for Wedge (Non-Hemi) GX390-style heads commonly found in Big Block Clones

FAQ

Q1: Do these valve guides fit Hemi-style heads?
A: No, these are designed for Wedge (Non-Hemi) heads only. Hemi heads have a different guide bore and valve geometry.


Q2: Can I use these guides with stock 6.5mm valves?
A: Yes, but you’ll need to precision ream or hone the inner diameter to match 6.5mm stems for correct valve clearance.


Q3: Why convert to 6mm valves?
A: 6mm valves are lighter, which helps reduce valvetrain mass for higher RPM performance, making them popular in racing and performance builds.

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