Thread: Hydraulic lifter help

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"Would a solid lifter have any movement?"
No
"What's inside a solid lifter?"
A plunger that is just there to provide a pushrod cup and a retainer wire at the top. No check valve, spring or any other superfluous parts.

All SBC lifters, whether solid or hydraulic, will have a hole in the side of the lifter body and a hole in the pushrod cup because that's the only way oil is provided to the rocker pivot to lubricate it, the pushrod/rocker interface, the rocker/valve tip interface and to provide oil to the springs to cool them. There is a hole in the side of the lifter bore in the block that is pressure fed from the oil galley and the lifter picks up oil through this hole.