If your going to do any class/heads-up racing stay with the wedge/conventional head as the predator head puts you in outlaw classes !!

Didn't know the MC B1's would flow close to 500CFM !!

For me I have to use a true wedge head in my class of racing and the PSO is the best option even if the gain is small...I paid around $2300 for mine bare and figure I will have from 8-10k in them finished...These heads are raw with nothing located on them and so far Slawko from out east is the only one I've found who has a cnc program for them...By the time he hand finishes them,softens the chamber and provides Ti valves you've dropped some serious coin !!