---
title: 'The 1-Degree Secret: Understanding Valve Interference Angles'
url: 'https://valverefacer.com/blog/understanding_angles'
markdown: 'https://valverefacer.com/blog/understanding_angles.md'
date: '2025-11-26'
description: 'Why do mechanics grind valves and seats at slightly different angles? Learn the secret of the "Interference Angle" and how it creates a perfect engine seal.'
taxonomy:
  category:
    - 'Valve Interference Angles & Sealing'
  tag:
    - 'engine valve sealing'
    - 'SVSII Deluxe machine'
    - 'valve refacer setup'
    - 'valve interference angle'
    - 'valve heat transfer'
    - 'valve and seat angle geometry'
    - 'engine valve longevity'
  archives_month:
    - nov_2025
  archives_year:
    - '2025'
---

# The 1-Degree Secret: Understanding Valve Interference Angles

---

## Navigation

- Parent: [Valve Refacing Articles](https://valverefacer.com/blog.md)
- Previous: [The Wobble Test: Why "Concentricity" is the Most Important Word in Repair](https://valverefacer.com/blog/concentricity.md)