i run auto lites 85 in my 70 runner 440,factory heads,went to change plugs and for the heck of it i thought i would try champions(don't remeber that number)but the champions seem that they protrude deeper then the auto lites(hope this makes sense)why is that? and i just ended up putting new auto lites instead,something told me not to go with the champs,thoughts?not looking for a who's a better plug. thanks

All i ever used in BB mopars was number 85 autolites. Never had a problem. I would say those champs were wrong number for application

Not a direct ans but you want the reach to be correct so there's no plug nor head threads not being used and therefore exposed to combustion which will create a hot spot and preignition. I'd make sure the champs have the same reach (3/4" iirc but not sure) as the autolite 85's that are known correct. EDIT make sure your choice is not tapered ones if the seat isn't tapered to match

thanks guys,i like the auto lites and will stick with them