easy way to tell if i got a solid cam or hydraulic?

it has the little snap ring at the top, so it is a hydraulic cam.

when i first did them, i set them 1/4 turn beyond "0" lash, spun it over by hand, and had no compression. so i figured that it was opening the valves too much.

i have them all set at "0" lash, and the engine runs perfect now.