[Billy Nees]

I finally took the time to "back-to-back" sparkplugs on Saturday and I was a bit suprised at my findings. When I put the car together, I put in the least expensive plugs that W-Mart had. Just basic plugs. I did an A-B-A-B test between them and a set of iridium plugs that I have used in some of my other stuff. So can a $16 set of plugs perform as well as a set of $64 plugs? Not quite, the iridium plugs averaged .034 ET. and .3 MPH faster than a basic plug. Are they worth the extra $48? In a heads-up or qualifying situation I guess they are. You decide.


For what it's worth, this is from my "Under the index for under a grand" thread. The base plugs were Autolites and the good plugs were AC Rapidfires. Are plugs worth the same in a real good HP engine as they are in a not-so-good lo-po engine? I can't answer that.