i just went to the auto parts store and checked out their inserts. i have a few more questions.

do i need to drill out the hole first?

what size is the spark plug thread? M14-1.25?

the 3.0 v6 uses flat-seat spark plugs, right? the inserts i saw at the auto-parts store didn't distinguish if it was for flat-seat or taper-seat spark plugs. does this matter?

thanks.


stock 1994 Toyota 4x4 XtraCab v6 SR5 pickup