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Tillotson 212-225 5mm Stock Valve Guides
Clone Non-Hemi 5mm Valve Guides
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Tillotson 212-225 5mm Stock Valve Guides

Part Number: 138190068
Online Price: $3.99
5mm Valve Guides for the Predator 212 Non-Hemi, Tillotson 212R and Tillotson 225 Cylinder Heads
Availability: In Stock.

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Description

5mm Stock Valve Guides – For Predator 212 Non-Hemi, Tillotson 212R/225RS & Clone Engines

OEM-style 5mm valve guides for non-hemi cylinder heads – ideal for stock replacement, 5.5mm-to-5mm conversions, or custom engine builds.


These 5mm Stock Valve Guides are designed for use in Predator 212 Non-Hemi, Tillotson 212R, 225RS, and other 196cc/212cc clone engines that utilize 5mm valve stems. Common in many performance and OEM-style non-hemi cylinder heads, these guides provide a precise fit for lightweight 5mm valves and are also a popular option for converting 5.5mm guide heads to 5mm setups.


These guides are also potentially compatible with Hemi-style heads, though fitment should be verified prior to installation due to different casting tolerances.


Note: These valve guides must be reamed to final size after installation for proper valve clearance.


Key Features:

  • Fits: Predator 212 Non-Hemi, Tillotson 212R / 225RS, Clone 196cc-212cc engines
  • OD: 9.65mm
  • ID: 4.7mm (requires finish reaming)
  • Length: 25mm
  • Material: Durable valve-grade alloy for longevity under heat and wear
  • Applications: OEM replacement, 5.5mm to 5mm conversion, custom builds
  • Finish Fitment: Must be reamed to proper valve-to-guide clearance


Valve-to-Guide Clearance Recommendations:

  • Intake Valve: 0.03–0.08mm
  • Exhaust Valve: 0.05–0.11mm

FAQ

Q1: What engines are these 5mm valve guides compatible with?

A: These guides are designed for:

  • Predator 212 Non-Hemi
  • Tillotson 212R and 225RS
  • Most 196cc and 212cc clone-style non-Hemi heads
    They may also work in some Hemi heads, but fitment should be checked before use.


Q2: Can I use these to convert from 5.5mm to 5mm valve stems?

A: Yes. These are often used to convert 5.5mm guide heads to accept 5mm stem valves, offering reduced weight and better high-RPM performance.


Q3: Do the valve guides require machining before use?

A: Yes. These guides must be reamed after installation to achieve the correct valve-to-guide clearance.


Q4: What is the recommended clearance between the valve and the guide?

A:

  • Intake valve: 0.03–0.08 mm
  • Exhaust valve: 0.05–0.11 mm


Q5: What are the dimensions of these guides?

A:

  • Outside Diameter (OD): 9.65 mm
  • Inside Diameter (ID): 4.7 mm (before reaming)
  • Length: 25 mm

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