Hello, I was wondering if there were any problems with SMOG check and your "B" cam now. I am also in CA. I just received a head from a machine shop, and they sent me the wrong casting #. I have a basic 530 head w/ "T" cam in a 94 940. I received an early 531 head with an "A" cam (from a boat motor). On a purely academic level, I made out. But I have been reading conflicting opinions.