best plugs?

[84wh1]

I know this has been asked a million times before but here it is again. What are the best spark plugs for these cars?

Thanks

 

[Turtle TR]

read up

http://www.turbobuick.com/forums/showthread.php?s=&threadid=71905

http://www.turbobuick.com/forums/showthread.php?s=&threadid=76292