How much voltage is too much

I've had good luck in the past with the old tried and true Standard Blue Streak coils. Have one on Vixen right now. To their credit, Standard Blue Streak parts are not made in China or globally. They are all made in Bialystok, Poland. Not USA, but not China.

Good to know they're still around! For some reason I had it in my head that they had gone away. I agree though, great parts and the important bit is "not China" ;)
That said, I was impressed with the bluestreak parts I handled in the past. They were very well made and had high quality connections and finishes.