Nick has responded to several threads where this kind of problem was proven to be caused by non resistor plugs. The problem I'm refering to is ignition break up. His response has always been to tell us the number of times he's used these plugs without issue. At the same time,he will mention breaking up issues after switching to E85 being fixed by installing the TR6 ignition system. He never tries to fix the breaking up issue by installing resistor plugs. He never recommended that you install resistor plugs to see if it fixed your problem because he refuses to admit that they are even a possible cause.
Your problem is not blown head gaskets. Your head gaskets are blown because of your problem.
You haven't even entered into the room where you keep the desk that contains the envelopes.
I believe you and I will not even start this car before I get those plugs this time. I also agree that a blown head gasket is a symptom of the problem, as the problem just kept getting worse...at first the car would just fall flat on its face with no stumbling or any other symptoms, then as we continued testing and trying to eliminate other issues it started popping and spitting and that is likely what blew the head gasket. I really hope the new plugs solve the issue! The previous owner had some really shoddy wiring under the dash that I have now cleared up and made it right as well. It is entirely possible that the wiring contributed to the issue and or the plugs. I wish I had read about these plugs prior to this build. Just so I can understand this completely what exactly causes the problem with the solid core plugs and why doesn't it happen with more mild builds? I also agree that we haven't even entered the room on the envelope, that is what has me so baffled here.