BBC Olds heads, info please

Can anyone tell me anythig about BBC olds heads casting #22538816 ?
They also have punched on the ends of the heads 706021 & PGR385A2 on one head while the other has 706041 & PGR384A2, thanks guys.

 

If I am not mistaken, those are the olds big chief heads. I believe they came as 14 degree deals, but don't know a ton about them. They fit most big chief intakes with a little work, unless they were completely bastardized. (Which lots were)
It would depend on who did them, and if they were for NHRA pro stock, or what class to see exactly what was done to them. If they were for NHRA, they could have been rolled over even further, to 11.5 or 12 degrees.
I guess I would need to know what you wanted in the way of info??

 

Wannabe, thanks for the info. As I understand they come in different valve angles but one of the numbers is a program that is suppose to tell you. If that is true then I dont understand why each head has a different number. Do you know if these heads work well in blown alcohol as I have heard of people having more trouble getting a tune with them. I would like to know why as I don't understand how this could be true.Sorry for the delay getting back as i've been a bit busy, thanks.

 

Why don't you just call Dart, they made the heads. If I remember right, 385 refers to the shape of the chamber and valve angle.