Hey everyone,
I thought I'd treat the car too some new sparkplugs, since I've never changed them during my ownership. I got some Ngk pfr6b-11 laser platinums, as recommended by many a forum search.
So today I set about changing them, and the ones that came out were ngk bkr6ek. After a quick search these seem to be for a Toyota mr2! Now I've owned this 300zx for almost a year now, and it's never once missed a beat, it's an NA, so I'm guessing if it was a TT I'd have had a lot more problems but still, pretty shocked it worked, the plugs don't even look similar!