You are correct x2. The heads are machined for a second set of tubes and o rings. On a nitro engine with big boost and very high nitro loads a second mag can be helpful. It's hard to fire the cylinder under those conditions. I'm not at that level yet. The long term plan is to set up the car so I can switch from gas to nitro on the fly. We are looking into using a air conditioner clutch to engage the dual drive. A hall effect ignition with a duty cycle would be used to set the timing. The heads would have the second spark plug hole finished. Then both mag and efi wires would always be connected along with the dual drive. It would be a big challenge to get it working with the fast efi box. We think it can be done. At pri the guys from fast looked at me kind of strange. That's ok I'm used to guys saying you want to do what?