I use copper anti-seize on the threads only. I'd like to see whoever claims that anti-seize on the threads hinders the ground provide some test information. I'm sure the contact between the seat of the spark plug, the aluminum spark plug tube, and the cylinder head provide plenty of ground even if the threads were completely insulated by the anti-seize.

[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"