Learning Center

• 

  Manufacturer's Numbering Systems

  How do I interpret the manufacturer's numbering systems?

  Learn More
• 

  Heat Range Conversion Chart

  Heat Range Conversion Chart

  Learn More
• 

  Using the Cross-Reference

  There's many convenient ways to access our extensive cross reference database...

  Learn More
• 

  Using the Reverse Engineering Tool

  Find parts by dimension and feature!

  Learn More
• 

  Using the Reverse Fitment Tool

  What in the world does this random spark plug go to?

  Learn More
• 

  Finding and Comparing Part Specifications

  Multiple tools are available to find part dimensions and features.

  Learn More
• 

  Engine Displacement Conversion Chart

  Engine Displacement Conversion Chart

  Learn More
• 

  NGK Resistor Cover Guide

  NGK Resistor Cover Guide

  Learn More
• 

  Autolite Spark Plug Numbering System

  Wondering what the numbers and letters on an Autolite spark plug mean?

  Learn More
• 

  Bosch Spark Plug Numbering System

  Wondering what the numbers and letters on a Bosch spark plug mean?

  Learn More