Thermoquad on 340 (plug photos)

I installed an Autolite 63 plug in #4 (the only new plug on the bench.)

Backed off timing 2* to 20*/32* (total @3000+ where advance leveled off) and went for a drive. Some around town, a couple of WOT runs from a stop up through 2nd, the rest mostly in town but opportunities to get on it pretty good. Pulled the plug and took photos. (I'll add them in a new post.)