Ended up using BR5ES-11 gapped to 0.40. Fired up right away.

I found the owners manual (knew I had it somewhere) and it states that B6ES-11, B5ES-11, B7ES-11 and the BR variants of the same plugs are all acceptable in the US.

BR6ES, BR5ES and BR7ES are the approved "Canada" plugs.

African or European?

A 5 is actually a hotter plug than Nissan recommended. Not sure why NGK would show differently. For many short trips where the engine might not heat up completely a 5 would be good. Extended freeway or constant speed trips (normal driving) a 6 might be better. 7 would be for extended trips with expected high engine temperatures and high loads, or racing.

Good to know - I'll probably switch to 6 down the road, when/if the car actually sees street duty. For now, while it's not safe to drive on the street, the hotter plugs will be fine for whatever moving of the car or testing needs to be done.

African or European?

Huh... I don't know that...

Ahhhhhh!

msglength

Hi

My experience sharing on last 3 years on my 77 Z.

Year of purchase: BPR5ES-11 (7634). Good crank, summer/winter

Year +1: new NGK wire set + BPR6ES (7811). OK summer/winter but less good than BPR5ES-11

Year +2: new cap & rotor + BR6ES11 (3824) - NOK much harder to fire up! Need to change

Now i am interested in explanation of somebody can...

 

@Captain:  was there coconut in UK during King Arthur's legend?

I think your variables changed every year


Sent from my iPhone using Classic Zcar Club mobile

1 hour ago, Labubre said:

@Captain:  was there coconut in UK during King Arthur's legend?

Absolutely. I've seen footage on TV.

I'm running BP8ES spark plugs (3.1L stroker) with no issues. With stock plugs (BP5ES) I had issues with dieseling/run-on. 

12 minutes ago, german240 said:

I'm running BP8ES spark plugs (3.1L stroker) with no issues. With stock plugs (BP5ES) I had issues with dieseling/run-on. 

What compression are you running?