anderson B21 anyone run one...

anyone running a anderson B21 cam? from what ive found its not that popular of a cam...

I think the B series of Anderson cams are the nitrous/blower ones. I currently run the n41, pretty stout for an off-the-shelf but I can't vouch for the b21. Give Rick or Brian a call at Anderson and see what they recommend if you're interested in the AFM cams.
 
Our B-21 works very well in its application, but, you are correct in that they are not in that great of a demand. This is due to the declining number of combinations that have a stock piston and 1.7 ratio rocker arms.
 
No, not unless the E7's have had larger valves installed. The same goes for any inline valve head with 1.90"-1.94" intake valves.
The E7's would need a valve spring upgrade though.