Thanks to both of you for your responsesStraight methanol will give a denser talcum powder coating but it is still a talcum powdered appearing surface.
Yes with the exception of the center electrode heat signature which will be slightly more difficult to see on the iridium.
Single OEM sensor (Bosch) attached to a motor mount stud using a step stud from McMaster Carr.
No because of the cylinder sensing logic John uses. The Vampire can see which cylinder fired last. When it hears a knock signature it knows it has to come from that last cylinder to fire. The others are too far advanced in the power stroke to be capable of knocking.
I like a stepped stud in one of the motor mount bolt holes.
BTW, while I recognize you are addressing the questions to me, Kevin is nailing the answers, dead on in his responses.