[steve25]

With what I have seen from having the RAII heads on the flow bench they flow like most any stock D port at lifts above .450” and flow really well on the exh side, in fact so much so that since your running headers I don’t think you want to run a cam with more exh duration then intake duration, since the headers themselves will pick up 4 to 5% more exh flow at lifts above .250”.

Note also that the stock tulip RAII intake valves are not the way to go.
The normal replacement nail head types flow better with that intake port.


Also on the subject of cams you did not mention what you have for rear gears?

That RA4 roller cam is going to act a good amount bigger then that 274 cam.