I'm planning on replacing all the vacuum lines on my 87 5.7. What sizes do I need to do this? They re all pretty hard and crusty other than the ones that are away from the motor and they are cracked very bad.
I just pulled my vac lines off and took them and the adapters down to NAPA and worked with one of the guys there to determine which diameter hose I needed and they cut it to length. Mine were a couple different inner diameters so don't assume they are all the same.