I'm going to get my truck tuned on monday and the tuner suggested I use either a Autolite AR103, or a NGK TR6. I have a 6# lower...is either one of these plugs better than the other?

 

I switched from Denso IT-22 to Autolite 103 after I burned up one of the Densos. It was only $11 for 8 Autolites. Originally I was going to buy NGK but the three stores I went to were out of them. So far the Autolites have worked fine.

 

Most of the tuners reccomend NGK TR6's or Denso IT24's for a 6lb pulley. I have a 6lb pulley and run TR6's without any problems though. The 103's are the same heat range as TR6's but someone else who uses them will have to tell you how well they work.





Plugs that have been tested above or check out Chucks Lightning site for more information on plugs:
http://home.midsouth.rr.com/lightnin...parkplugs.html