Which spark plugs?

I think that N6Y's were superseded (or at least "replaced by") N7Y. I also think the early 2000TC decals did specify N6Y's, but the later models had the decal specifying N7Y's (certainly the old UK J reg 2000TC we scrapped had N7Y's on the decal)

Maybe someone could confirm/agree/partially agree/totally deny... this?

This is an old thread, so my apologies for re-awakening it, but I ran across it while looking for the proper plugs to put in my early 2000TC, and as it happens, I can confirm that the early TCs did come with a label specifying Champion N-6Y plugs:

RkKC6VknBdNfTg2n4Af_YeeMO2fQ0x1UFIrUPKB7COin7k6iRCzIjJFmcTYds9JdfQxB0wohTnnOv3e7t6bdcdOFeraImmBtcP5AFtGro-FM5bH_0mxTktr16PgzafTbQM_WlVzzJV5kewYUeI1X6owTCVNjNOMgL69kauEn_Ng09xk-TUFwBYLXQ4rHlcKbGe-0SVXRMOun-Vdr3ATBa48IdtzEpmaCZv2-5GtaVBVJZCiMMoWAHDC_F8xQd0w4vDhIkGO6d6M7cmI_onhW-oTqwr8kNqggg8SsvOX4X9QnHtV48gvBOLN6gKI1rzS1jf7d5Q1CLyu9-gTLNxXnJq4svsEb_EoNmBT7BYX0Z3ul4C3DKojTegvjnEiTv3cjyZfe7aY-6ptUhs7URS9aedSetp38JZ-k34TRAL8TiMaz_KnWXM1FCym3XsDI5F11VAoC1Ga7dCW46cLtRy0pR13piTJgMrsOLxnr0NIsFgdvJYNdbmfcVPSyYQfdd26jcyun6I9xz16_wkXS7PjuKm9l_Ld89itwl4B_OE5NLM-yYKco3udC0oV95jlY8B4u7h2XtUtYTcLYmo2FU8dVGimpAheI1rf2PToP8n3gsbHiigJJQtZf=w700-h946-no
 
Again waking a dormant thread. I went on the Champion website the other day as I'm getting new plugs for my 2000TC. Champion now list N9Y as the correct plugs. I know Rover changed spec from N6Y to N7Y in the early 70's. Anybody have an idea if the hotter plugs are ok? Any issues with pinking?
 
The engine's haven't changed, but the fuel has so maybe that's the reason, but TBH I'd stick with N7Y until I had a good reason to change.
 
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