The only Alfas I know that were fitted with a vacuum advance were the ones with a single downdraft carb - 750/101 Normale Giuliettas, 101 Giulia Spiders and Sprints, and Giulia TI sedans. Anything with double carbs or Spica injection had a mechanical distributor. Some later european model must have had vacuum, as Highgate Alfa in UK is clearing some NOS Bosch vacuum distributors. Maybe some 80's euro Alfettas and Giuliettas.Why did alfa use vacuum advance on some engines and not on every engine? Are there any differences between the Bosch distributors except for the vacuum thing? Is it OK to just disconnect the pipe? 2000 engine with carbs.