Napa Part No. Echlin MO-3000

It used to be a well know fact that GM V8 rotors (back in the "points" days) were two different lengths. I was told by a Champion spark plug guy that GM actually SHORTENED the rotor to act as a "spark intensifier." He claimed the champion "booster gap" plugs (the old "U" series) came out first, and "GM screwed Champion" by coming out with the short rotor.

(I see Champion has somewhat re-introduced this idea for small engines with their "EZ start" or "One pull" plugs.)

So who knows? Without a bunch of testing, it might just be counterproductive.