Mixing Spark Plugs

[Geico266]

I have 6 new fine wire plugs and 6 old massive plugs I would like to install in my IO-540. Can all of the fine wire go on top or should I change out all of the plugs associated with one mag, meaning 3 on top and 3 on the bottom.

I can only get 6 fine wire plugs now, and I am waiting for the new 6 clyinder Pmag to come out.

Does it make a difference or am I over thinking this..?

Thanks in advance.

[Walt]

I'd put the fine wires in the bottom because they are less prone to lead fouling. The Mag don't care which model plug it fires.

[Geico266]

Thanks Walt, I thought I was over thinking it.