Duane, just to reiterate...... in the Mopar world...... the difference between what’s considered an “open” or “closed” chamber head is only the portion of the chamber that’s opposite the spark plug.
The quench/squish area of the chamber.
If this is even with the deck of the head, it’s a closed chamber.
If there is an area there that’s pulled up off the deck surface, it’s an open chamber head.
On a SB head, this area would only be a couple of cc’s worth of volume, so it has little impact on the CR, and in itself has virtually no impact on flow.
What it does impact though, is how easily one can build a motor that has effective quench.
