I know there's allot of info out there already but not for my situation. I have a 390ci, 9.6:1 compression, 853 heads, plan on runing a 250shot. Not sure if I'm going to buy a nitrous kit or if I'm just going to wait for the turbo kit. But I would like to be ready for nitrous if I'm going to use it. Changing plugs now because my engine is out of the car. Also would a colder plug make the car feel different when running N/A?

 

Br7ef at least. Should run fine on the motor. Mine does.

 

250 shot I would run BR8EFS I believe br7ef are a projected tip plug not good when you start running above a 200 hit.

 

So now we wait for the next person to brake the tie haha. Although the non projected tip does make sence.

 

BR7EF is a non projected tip, with that compression and size shot you'd toe the line for a Br7ef or a B8EFS. For a 250 hit though I'd use an 8.

May need to lean it up at idle and cruise to make it run exactly the same on the -8 I know I did. 7's I didn't notice it.

 

So I guess il get the B8EFS then.

 

Ask for NGK part number 1049. It will make it easier for them to locate in the system where ever you buy them from.