I found a vintage set of AC R44TS triple green striped insulator, spark plugs on ebay. I got them for $14 from someone selling estate stuff from an old garage. I installed them today, replacing the recent AC R44TS set that was put in there a couple years ago. The car runs noticeably smoother. (Probably because one or two of the plug wires were not fully seated on the plugs to begin with).
The plugs I pulled out all had nice tan insulators and appeared to be burning nicely. The one thing I noticed was that the vintage green stripe plugs have a 3/8" shorter insulator than the modern versions. Anyone have any idea why they made the modern ones longer?
