I know this is an older thread...But did anyone get a definitive answer as to what where the actual specs of the A-12 cam? It sounded like someone had an orig. A-12 cam they were going to blueprint but never posted their findings.

From the links above you can see some magazines of the time printed the specs as 276/292 duration - 54 overlap, and some stated it was the same 268/284 duration - 46 overlap cam found in the 440/383 Hi-Po motors.