I might be a little behind the power curve, sorry if I am, but I've been looking for colder plugs and read a post about TR7 spark plugs seem to be hard to find. And I found a site that sells them. Hopefully this helps someone out.
NGK-TR7 Spark Plugs
 
 
Get the ngk TR6 plugs, I love them. 1 step colder
 
 
the TR7 plugs are 2 steps colder correct? From what I have read, they are an awesome plug.
I was a retard, and now I'm permanently banned.
 
i though the 5's were a step colder than the 6's ??
ive got the tr6's in mine and no problems
 
 
 
unless you need the 2 steps dont get them, misfire prolbems
 
 
are the 5's colder than the ones that come with the gm super charger (champions)
 
^ 
   
really?   mine were AC delco... and TR-5's are the stock heat range... with NGK the larger the number the coolder the plug.
here is a link to there site.
NGK InFo
Chris
'02 Z-24 Supercharged
13.7 @102.45 MPH  Third Place, 2007 GMSC Bash  SOLD AS OF 01MAR08
 
 
Taetsch Z24 wrote:^ 
   
really?   mine were AC delco... and TR-5's are the stock heat range... with NGK the larger the number the coolder the plug.
here is a link to there site.NGK InFo
Chris
that's correct. the TR-5's are a stock heat range.
I was a retard, and now I'm permanently banned.