Emission Hoses

[91gmblack]

Hi All,

I plan on replacing all my vacuum, PCV, & emission hoses that connect from the bottom of the upper plenum (1991 GM, 5.0).

Does anybody know what sizes I will need?

There's a whole bunch of them connected under the plenum and I'd like to have them before I take my car out of service to do the job.

Thanks,
91gmblack

[Archangel]

I put 1/4" ones on mine, think that was the right size.

[89LincolnTWNcar]

there is a bunch of 3/8 and some 5/16 under there.