The quench areas in the chamber are comparatively small and oddly distributed (compared to a conventional "wedge" chamber such as SBC). It does resemble the Mercedes-Benz 230 SL L6 and Jaguar V12 "Fireball" chambers.
The rising stovebolt piston does expell mixture from a small area lateral to the intake valve seat toward the exhaust pocket (where the largest volume is contained) as it approaches TDC on the compression cycle, and closing this distance to a safe practical dimension was part of the original design.
