Ah, the 1920s Harley pushrod cam—yes, I've spent nights dissecting its tiny teeth, mapping each notch to the rhythm of the engine. Those cam lobe profiles, the way they dovetail with the pushrods, it's almost like a fossilized melody. If you want to truly grasp its soul, you have to treat it like a manuscript: read each groove, note the wear patterns, and see what secrets it keeps beneath the dust.