here's what i measured...
Cruise Control Servo
Large port 9/32"
Small port 7/32"
Vacuum ball 7/32"
Washer Resevoir 8/32"
Washer Nozzles 7/32"
Charcoal Canister
To Tank 10/32"
Solenoid 8/32"
EGR to Solenoid 5/32"
Vacuum to EGR Solenoid/Check Valve for HVAC/Cruise 9/32"
Brake Booster 3/8" (9-9.5mm)
AFR 6.5/32"
Vacuum Block
3 ports 8/32"
1 port 6/32"
1 port 12/32"
PCV 12/32"
Wastegate Y-hose 8/32"
Total Lengths For Car
4mm = 122"
6mm = 147"
8mm = 46.5"
I measured these ID's with a caliper at the port itself. I'm going to try and put together a silicone hose kit to replace all the rubber vacuum lines on the car. Lengths were measured with a fabric tape measure.
If anyone has some input into these sizes, or if they are slightly off, just post your corrections and where your source material is. If you still have original GM hoses on your car, the sizes should be listed on them. A lot of the lines on my car have been replaced.