The compression ratio between the two open chamber head motors was different because they used different pistons.
The quench chamber head intake ports were cleaned up under the valves identical to the open chamber heads and both flowed right at 300 cfm.
The quench chamber head exhaust ports were mildly ported and flowed 209 cfm ... the open chamber heads had more work done to the exhaust side and flowed 228 cfm.
Kid V does not believe that 19 cfm difference in flow explains the difference in how the motors ran....especially when the one with better exhaust flow had 2 points less compression.
The open chamber heads already had 0.050" milled off of them and the chambers were down to 67 cc's ... they couldn't take much more off them and have any deck thickness left.
The open chamber motor had a solid flat tappet camshaft, the quench chamber motor had a solid roller.
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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!