Which is this open or closed chambered head ? Small block

[Red70340Cuda]

   Can anyone tell me if this head is open or closed chambered ?  It's a 1973 casting number 3671587 I believe it's a 73 340 head  but I have seen that it comes on some 360 also I guess . Not sure what cc's it is either ?
Also what consider a open or closed Chambered head ?   Thanks

[torredcuda]

https://www.forabodiesonly.com/mopar/threads/small-block-cylinder-heads-stock-specs.249026/

[gzig5]

An open chamber head has a cylindrical area where the piston could go into if it came out of the deck.  A closed chamber does not.  closed chamber is typically smaller CC volume and would give higher compression all else being equal.