---
title: 'The Wobble Test: Why "Concentricity" is the Most Important Word in Repair'
url: 'https://valverefacer.com/blog/concentricity'
markdown: 'https://valverefacer.com/blog/concentricity.md'
date: '2025-12-11'
description: 'The Spinning Top Test Imagine spinning a top on a table. If it is perfect, it spins smoothly in one spot—it almost looks like it is standing still. Now, imagine that top is slightly bent. It wobbles. It wanders around the table. It vibrates. Your engine valves are just like that spinning top. They …'
taxonomy:
  category:
    - 'Valve Concentricity & Runout'
  tag:
    - 'SVSII Deluxe machine'
    - 'valve concentricity'
    - 'valve runout'
    - 'centerline grinding'
    - 'worn valve stem'
    - '6-ball chuck'
    - 'runout gauge testing'
  archives_month:
    - dec_2025
  archives_year:
    - '2025'
---

# The Wobble Test: Why "Concentricity" is the Most Important Word in Repair

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## Navigation

- Parent: [Valve Refacing Articles](https://valverefacer.com/blog.md)
- Previous: [Why Does My Valve Look Rough? How to Stop "Chatter" Marks](https://valverefacer.com/blog/stop-chatter.md)
- Next: [The 1-Degree Secret: Understanding Valve Interference Angles](https://valverefacer.com/blog/understanding_angles.md)