hi guys, just a quick question, i have a uk 1992 twin turbo z32. i was in the states last month and purchased a set of 6 ngk/nissan PFR6B-11B spark plugs from courtesy nissan. when i removed my original plugs i found them to be PFR6B-11C.

 

i have read that the 11c is the uk spec plug, why use different plugs in the US and UK? what are the differences?

 

finally and more importantly, is it ok to have put the '-11B plugs in my car?

 

thanks

darren

11b's are fine, they have a longer tip/thread and are recommended change for zed's running higher boost.