Ok guys need your opinion's on spark plugs with my mods??.

[JoEgsX90]

Ok guys if you take a look at my profile can see all my mods.. basically built 6bolt block with a 7bolt built head and 272 BC cams, 190 rewired fuel pump with STOCK injectors. Running about 12-14 psi. I have a set of BPR7ES in it and noticed when i pulled them out very black burned. Maybe from running rich, i had a bad o2 sensor for awhile and was running VERY rich around around 12's on my wideband. After changing my o2 now have it just right around 14.8-16... I was wondering should i switch to 6's or keep the 7's??? im going to run stock boost for now for awhile.

 

[andy4g63]

6's would be plenty.

 

[JoEgsX90]

Yea that's what i thought, This car has had 7's in since the build. I didn't start it so didn't know they were in there. They all have dry black composite on them. Ill probably put some brand new 6's in there see how they run.

Forgot to add i got 10.5 mm spark plug wires..... Should i keep them or go to about 8.5??