I knew there would be a good answer to this, I just didn't know what it was, Thanks.
With the original 911R/ 906 spec motor they used twin plugs because the piston had a high dome and the head design not optimal. but what if you are using later heads, like from a 71T, that flow better, and compression that is 10-1 or less. Cost no object , great, but it looks like twin plugging adds at least $3,500-4,000 to the build. I'm trying to be a bit more economical these days while still being extravagant.
