Hello, can anyone tell about the famous bbc 781 heads. How good do they flow? Is there any needed work for street performance? How would they rate against Dart, World or any other after market heads. Thanks in advance.

Supposedly they flow a little better than the 049's as they have a 3cc larger runner (I think?).

http://www.carcraft.com/techarticles/41598/index8.html

Here is the 049 data.