[T-man]

I guess I could go look this up somewhere, but can someone give me the skinny on the NGK plug numbering? The higher the number = colder or warmer the plug?

T-man

 

[QKENUF4U]

if i remember right HIGHER=COLDER with NGK ONLY. others go the other way. :roll:

 

[joey]

that is correct the higher the number the colder the plug - example a DPR7EA is a hotter plug than a DPR8EA.