Proper vacuum readings

[Diseazd]

Can anyone confirm what the proper vacuum reading should be on a carbureted L28 at idle? Thanks Guy

[240260280z]

17-20 "Hg on an EFI. I assume it will be the same on a carb: http://atlanticz.ca/zclub/techtips/vacuum/

[Diseazd]

Thanks Blue......that's just what I was looking for! Anyone know where to get a set- up like the one used to hook up to the brake booster port.........like the step down in Blue's post? The booster port is too big of a diameter for the hose on my vacuum gauge. Guy