what size plugs?

[SPEEDYLIFSAVR]

actually this is a 2 part plug question.....

What size are the thermactor plugs that go in the back of the gt-40P heads ?

what spark plugs should I use on my gt-40p heads?

Thanks!

 

[Lxstang306]

i ran in to this with my gt40p heads u have to get spark plugs for the explorer that use a diff plug. if i remember right auto light plug number is 954 for gt40 p heads easy way to get spark plug get them for a v8 explorer