Could I have gotten a bad spark plug? I just installed new ones along with wires the same time I did the headers. NGK 55 gapped at .060, and magnacore wires.

 

My guess is you cracked it during the install(which you may not see). To test this install 1 old plug and wire on #2

on another note I believe OE plugs and wires are the best,anthing else is a waste of money and potential issues