was about to fit new NGK pfr7b spark plugs to my car only to find out it has NGK pfr6b fitted in decent condition, am not sure if there worth changing but the ones fitted have a gap of 0.85 is the correct gap 0.7???
is it worth changing these for the 7's the car is a classic my00 sti with K&n panel filter ,a full decat and remap on the cards.

 

7's with 0.7mm gap

 

thanks for the reply ian

 

The 6's are the standard fit, but ppl upgrade to 7's
Gap should be between 0.7-0.8

 

i've always been told to space them at 0.6 on both

to date, i always do this. never had any probs at all