eBay Prototype ball-stud Hemi

Backtobasics said

It was a prototype of what the next generation of HEMI would have been. The goal was a lower maintainence engine, that did not need the frequent lash adjustments that the solid lifter design needed. This would have adjusted much like a small block chevy, but rather it would have been torqued down, and DONE.

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It also had much shallower/smaller chambers and the valves weren't located in a perfect cross-flow arrangement. This saved space, reduced weight, and simplified the valvetrain setup, as well as improved combustion dynamics (especially on higher-compression N/A applications) by not requiring a huge piston dome to keep the compression up.