sparkplugs sized for 4.6 or 3.9

[Davis]

I have asked a couple of people that both have different answers and I am still dialing in my motor.

When have a 4.6 block and are running all the induction and management systems from a 3.9, how do you choose your spark plugs?

[Mike Hippert]

I thought they used the same plugs?

Rovers North lists the same #s

http://www.roversnorth.com/RRD04/RRD04_17_20/RRD04_page20.htm

http://www.roversnorth.com/RRD04/RRD04_21_24/RRD04_page21.htm