Well just read the thread about the os.55 on the f-20. I remeber asking myself sometime back how do you tell if the porting/timing is made for torque or for high rpms? Well I dunno. Maybe someone could let me in on how to tell. I mean would the timing ports be closer togther or spaced out more? Would the ports be bigger or smaller? Would you have a small intake and a large exhaust port or visverse?

Kevin