Originally Posted by 28gauge
I think a cooler plug might lessen the chance of pinging, which I get once and a while only under a severe lug.
Ummm... Why not just stop (severely) lugging the motor? If you lug the motor enough to start caring about the pinging caused by it, then you will soon have other issues to worry about like damage to your motor, tranny, clutch, gaskets etc.
For your build the regular HD plugs should do just fine.