Killer bee port depth

Yes, those are good. Mine are old as me and getting hard to read. For some reason I was always messing with points on my old Chevy V8s. One time I put the rotor back 180 degrees off, square peg in round hole thing. Put cap back on and cranked the biggest backfire out my glass packs I ever heard. Sounded like a bomb. LOL OOOPPPPSSS. I had glass packs with pipes the came out the sides in front of the rear tires. In those old engines you could turn the key off for a few seconds and when turned back on would backfire. Got many bridge fisherman and pedestrians that way. Was that wrong?

Thanks crankbndr @ others sounds spot on my measurements for a
Surestart fly are total port opening Inc centre bar .100 with bernies mod
Ie removing centre bar & deepening port .131 giving spi of .030 with
Tightly clinched ballpoint however after abt 30 minutes running the ball joint
& big end have settled into pretty mutch there best running clearances
& all will now measure approx .026 .027 ideal for high speed work
Being approx 85 degrees good when you consider the frog 150r & half in
Hurrikan came from the factory sporting 80 degrees Spi
Thanks all
James clive