I've used gobs of anti-seize on my spark plugs forever. Never a bit o' trouble. HOWEVER, I also use a spark plug tap every time to guarantee nice clean threads for the new plugs. Saves a ton of grief! Randy (Cap'n) Hook '60 700 4dr '64' 110/4spd '63 '500' ragtop 110/pg '65 Monza 4dr 84/pg