Ok , silly question. I have almost always used copper champion plugs but after the break in and running my engine on the stand in pulled all the plugs. 2 and 6 look like they are running a little lean and 1,8 like they are rich 10.25:1 compression, rpm air gap intake, Tbi efi. a/f ratio a nice 14 at idle. 418 stroker w/ indy t/a heads.Just wondering what you guys are using
