Originally Posted by markdunlap
E3 is not for racing in my opinion, just street cars and maybe just a fad?
NGK plugs work well and can be read because of their plating that changes color with heat.
R-5671A-8 or 9 will work in alot of instances. I like 8 for gas and 9 for alky. Every engine combination is different though.
i second that :wink: NGK's are the only plugs to run.... i actually tried the accell U-grove plugs before and they worked very well.... very short and great for headers......just hard to find .... NGK's are everywhere
