From an MSN message board....

"3973370" – A good over the counter head. They had 64CC combustion chambers, supposedly straight or angle plug configuration. Used a set of these on all 3 of my 383 strokers, they originally came with 1.94/1.50" valves. We did some major port massaging and installed 2.02/1.60" valves, they responded very well to the modifications and worked very well. The combustion chambers were 64CC's. These were a decent iron head, with a lot of potential for performance.