Head Porting
Its crude, done with my finger on my phone. Shaded dark is how much floor work 'roughly' it takes to touch 195-200 cfm int flow. Of course there is a shape needed, i dont bother with the roof much at all. Stay away from the guide boss, do not raise the roof around it either. One side will yield a water jacket .060-.080 deep. If you arent confident...dont do it. Send it to somone like me. Good luck.
