Okay,

I have measured the depth of relief and protrusion of prechambers. If I move all the prechambers up 2.5 millimeters they will all clear by at least the thickness of the head gasket. Since these are not moving parts like valves, it would seem that .030" would be plenty of cleaance.

Here's the question. Assuming that there is already a standard 2mm seal ring in place, will have plenty of room to add a 2mm and a 1mm or even a couple of 2mm seal rings, without running out of threads on the prechamber nut? I am assuming there is plenty of room there, but I'm hoping someone call answer this before I order parts.

Thanks for your help,