Car has 7's in it now and it runs well at a 150*. I want to go to a 250 shot. I was recommended to go to a non projected tip. So I was thinking of getting 9's? is that too cold? Here are a couple that I was looking at



What one would work best?

 

Personally for a 250, I would go with a B8EFS. We recommend 1 step cooler plug per 100hp normally, being that you are wanting to spray 250, I would stick with an 8 range plug, that way you don't have any issues with fouling or idle running such a cold plug.

Thanks,
Garrett

 

Thanks! I ordered some!

 

I used -9's on 175 and -10's on 250.
I like to start colder and work my up to a hotter plug.
LQ4 SBE.