My 422 smallblock build

SSG_Karg said

I do plan to disassemble at least one mostly to clean and inspect, but also out of curiosity now.

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Took one apart. Below the snap ring is the pushrod cup and below that is a solid disc that seats on a lip inside the lifter body. There is an empty cavity under the disc. I have to assume that the same lifter body is used for solid and hydraulic lifters. The hydro version would have a spring in place of the solid disc. Of course this is just speculation on my part.