What spark plugs to use in brodix heads?

[91CoupeMike]

I find this thread really funny considering you're a parts guy, hahahaaa.

Lol. Well our parts look up doesn't have an option for st r 5.0 brodix heads.

Plus we don't even carry half the damn plugs.

[Diabolic]

Mike I run the NGK R5671A-8


Then remove immediately after shutting off the engine and cut apart to inspect like the pics below.