340 Oil Priming Question First Start

Hydraulic lifters will have a retaining clip in the top of em. Pretty easy to identify. Solids will not. You can peek down with a flashlight and see it through a pushrod hole even with the intake on. Another way to tell is take a pushrod and seat it in the lifter and push down on it. You’ll get some spongy movement. If the engine has just run or been primed this is a harder way to identify them as the lifters will be pumped up. Below is a hydraulic lifter.
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Yes sir. A lot of solid lifters have the wire retainer or snap ring. Those are higher end oil metering solid lifters. So be careful when you're verifying.