stage II spark plugs

[summit]

looking to try something besides the AR472 autolites. Still having a high RPM miss problem and am wondering if the street driving may not be aggreeing with the cut back electrodes? Any suggestions?
Greg Kring
Arlington, texas

 

[Bob Mustic]

Autolite 103

I use the Autolite 103 in my Stage II heads. It is normally aspirated but the motor works fine with these up to its 8200 RPM rev limiter setting.

Regards,

 

[Bad as L]

Try a NGK BR7EF....or if you don't mind spending a little money try the Denso IT 22.....cold, extended tip or the IT 24.....really cold, standard tip. A NGK TR6 might also work, I know it would run great, but I'm not sure if it would be cold enough under boost.
It is an extended tip, fairly cold plug, it is one of my favorites in other applications.
Either the NGK's or the Denso's should run better and have better throttle response than the Autolites IMHO.
Dale