The hole is not on the intake manifold, but on the phenolic spacer and base of the carb flange, tip the carb upside down and look for the vacuum hole on the mating flange.

See the divot to introduce vacuum on this spacer

https://www.chevsofthe40s.com/detai..._Bakelite_Insulator_Carb_Base_235ci.html

Last edited by sstock; 08/24/2019 1:59 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration