The 351C combustion chamber design is not a hemi, its a very shallow poly-angle combustion chamber that works very well fueled by gasoline. With nothing to coorborate my assumption, I have always assumed its the chamber's shallow design that allows it to function as well as it does. My comments apply to both the quench chamber version and the open chamber version.
The best 2 valve combustion chambers seem to be the shallow ones don't you think? Shallow chambers require valves with low angles of inclination, they unshrowd the valves, and they seem to be good at swirling the mixture. Shallow chambers do not hide any part of the chamber from the flame front. So even though the 351C open chamber heads are not compact, they actually work fairly well.
I agree the latest high swirl combustion chamber designs are generally very good. By the way, the high swirl combustion chamber design originated with Harry Weslake and may go back as far as the 1930s.
-G
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If you use a 351C 4V powered vehicle for a grocery getter ... the eggs aren't going to make it home!
