Originally Posted by 360view
If it were my vehicle, after making the investment in a wide range AFR sensor, I would make the best use of the $ by installing eight bungs on all cylinders. After measuring and getting 8 cylinders balanced to your preferred tolerance, leave the AFR either in the “most average” cylinder, or in the leanest cylinder if you fear detonation on some of the future fuel you might have to use.

The leanest cylinder can be determined with a plug reading so only one bung is needed

HEMI-ITIS has no cure.
My condition is fully BLOWN!!