Which plugs are best?

[Grim]

adam 32, with the right tools...it is easy to change your own plugs. It takes a bit of time to get to them but it is not hard.

[NIZ180]

Merli, It says on the box 0.6mm the Iridium IX say 0.8mm

[Spurdo]

a lot of guys here seem to be referring to plugs coming "pre-gapped" to 0.x etc. although i think some (maybe even most) plugs are supposed to come with some kind of factory preset gap, my advice is to NEVER assume the gap is set correctly straight out of the box, and anyone who tells you they are is probably lying. i have replaced many, many plugs over the years in various vehicles i've owned and the gaps are never uniform. ever. i have seen plugs come with no gap at all, and i have seen some with a huge gap that surely no engine would run without major ignition problems.

ALWAYS set the gap yourself, never assume it is already done for you. especially in modified engines where it might mean the difference between mis-fire or no mis-fire. it only takes a moment to get right so you'd be silly not to.

[PM-R33]

Wow, talk about replying in an old thread, this thread is 8 years old!

Not sure what plugs you are using but I occasionaly check my .8 pre-gapped NGK plugs and they are always perfect.

[GTRPowa]

Yeah all this talk of 7 year old Skylines made me notice lol.

I check mine for the same reason, I've dropped the occasional plug myself

I haven't seen them more than 0.02mm out.