On Fri, 27 Nov 1998, Chuck Koenen SR. wrote: > Autolite 86's. The existing ones (86)center electrode sticks out about > an 1/8 inch further than the new ones (303). I'm not sure why I think it Dunno if one is better than the other, but my '72 Scout II came to me with 303s in the 304.. I've since switched to the 86s and Champion RJ12YCs.