13:1 Compression Pistons in 340 Small Block

Duane said

Small combustion chambers only work better as far as quench which the intent is primarily to run pump gas without detonation.
Some designs of small chambers inhibit the breathing of the head.
Flat top Pistons on a modern build are really only possible on a stroker build because of the increased swept area, otherwise it would be very hard to get any kind of decent compression.
Each type build has its pro and cons. It depends on the intended goals of the build and operating costs of the fuel.

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If Geo would go back and read what I originally told the OP he would understand you can have open chamber hands and still get quench. I even explained how to do it.

As you mentioned, there are plenty of horrible closed chambers out there. They are flow killers and they are detonation prone. The early BBC heads are just one example. But the hipster trendy deal is the crap posted about those Pistons. Find a new piston with the same dome and pin height and you'll find the weights are pretty close. They have a 1/16-1/16-3/16 ring pack which is pretty much standard now, and they can run relatively tight piston to wall clearances.

All the keyboard builders here have no clue.