Wait to hear from other members.
I think you will have to take off the side cover and the valve cover.
You then might get away with:
Take off one of the rocker arm adjustment nuts and remove the adjustment screw.
You might then be able to lift out one of the push rods, and pull out one of the lifters.
The hydraulic lifter looks different from a mechanical lifter.
Let's hope another member will post how to ID the lifter (and post a link to a photo.
Hope also that another member will describe a clear/easier way to definitively ID a hydraulic lifter.
I'll apologize in advance for this rambling response.
Worst case scenario is that you will have to remove the rocker arm assembly, pull a lifter, and inspect the top of the lifter.
