I know I want the TR55 plugs but what is their part # at napa?

They have a 3403 (G power) and a 3951 (V power) listed.

 

3951= TR55

 

yep, just looked at the box my TR55's came in, and it says 3951 on the bottom flap.

 

what is a rough cost on a set of them?
JOHN

 

They should be about $2 a piece. Thats what mine cost at Thunder Racing minus shipping. Also the boxes say "V-Power".

 

I ordered mine from thunderracing.com too. They were here in less than 2 days. Thunder Racing is great!

 

is that the best plug then?

 

In a manner of speaking there is no such thing as THE best plug. There are too many variables on each engine set up to say one plug is better than another. NGK is a good manufacturer and better than most for making a quality product. I use NGK plugs on several of my vehicles.

 

Are you certain you want the copper jobs or the plats? I you want the plats the NGK number is TR55VX and run about $50.00.

The coppers are better conductors, but the plats last longer, if you are concerned about the PIA of changing them out.