> Is there any indicator that says it is better to use a cold
> plug versus a hot
> one?
The "best" heat range for your engine is the one that lets the plug tip get
hot enough to burn off deposits; while not overheating; for the kind of
driving you do.
> How about after rebuilding the engine? After installing
> electronic ignition?
At least in theory, neither of those things should make a difference.
Assuming of course you didn't go to a hotter plug when the engine was worn
out, in an attempt to burn off the oil deposits quicker.
That said, I found that when running conventional plugs on my TR3A, with a
MSD6 and mostly freeway driving, I needed to go one range colder. But the
problem went away when I switched to a "platinum" plug with a different nose
design.
Randall
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