Pay close attention, my Padawan.
The first rule of using lightsabers to block incoming blaster fire on a vehiclular scale is this:
Do not!
We're clear on that?
Great!
Now, the second rule is, "Do what I say. Not what I do."
(Actually that's more Ben's rule. I borrowed it when the twins left the toddler stage.)
In your case … It might be survivable, yes, that's hypothetically possible. Depends on your position. Depends on the vehicular weapon. Depends on, oh, air temperature. Fluctuations in the Force around you. Timing. Angles. Whether you have a useful place to redirect the blast. Aperture diameter.
If you have to try it, if it's "parry laser cannon beams" or "get vaporized", maximize the chaff between you and the weapon. Minimize the amount of time your lightsabers spend in contact with the beam. Use obtuse angles of deflection only.
Put most of your effort into being where the blast will not be.
- Jedi Master Anakin Skywalker
Atunda, 11 Kelona, 12721