Feeler gauges are the only thing you should use.

Those POS gapper disc are garbage! They are not worth the metal they are stamped from.


The only thing I could possibly state to the contrary is plugs like the POS Bosch +2 or +4 style.

Otherwise you gap EVERY plug and YES no matter even if they say they are pre-gapped.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.