Annular boosters on a Tunnel Ram

Rat Bastid said

Because I love self flagellation, what diameter are the Venturii and how many holes are in the boosters?

TIA

Click to expand...

1.385 at the top, but my tool hit the bottom of the booster so I’m thinking it’s just a smidge smaller, not much maybe another .01

1.674 at the bottom and 12 holes in each booster.