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from my experience with the AR's I would give them a try they have been great in mine.



Since I'm not familiar with their plugs number wise
what would you suggest..... 11:1 engine
thanks




well I can tell you that the list I found show a
AR 3910 = a c59yc
Ar 3911 = a c61yc
does that help any
the 3911 ran fine in the motor at 12.5-1 and I am still running that plug now at 14-1
The 3910 would be a step colder.



Thanks... I'll try the 3911 after I get the car running
and see how they act