Well what I'm basically looking for is a plug that'll last a good while, keep the car running nice and smooth, and not foul easily. Because the way the air temperature keeps changing (FL can't decide whether it wants to be winter or summer right now), I find myself tweaking with the AFPR fairly often....and as I mentioned earlier, I leaned the last set of plugs out, then richened the crap out of them. Now the car stumbles at idle...and it isn't from the cam because it never used to stumble idling at 1100 rpms. And it surges REAL bad too, but that's a separate problem I think that's usually started by running the a/c.
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'91 Mustang GT 5.0 AOD Daily Driver
Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI
13.73 at 103.8, ~2.2 60'
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