BEST SPARK PLUG

[LN]

What is the best plug to run in an M , 4.125 bore with firecraters, 8060 head , aftermarket pulling cam ,any help or suggestions appreciated

 

[Charles E. McNelly III]

I don't know anything about "BEST" but Champion D21's work good for me. I used to run the autolites but my motor seems to like the Champions better. For the price it doesn't hurt to try. Good Luck,
Charles

 

[LN]

also wanted to ask would a C88L AC plug be a good choice seems to be longer than other plugs should put the ignition flame closer to the cylinder?

 

[buickaddeere]

Autolight 3116 non resistor and solid core wires.