Head Porting basics

the main part to porting is flow think of your heads with water going threw them.and if you look under your valves you will see what i call a porch roof or a lip.taking that out and blending it in makes a big difference then gasket matching makes a big difference.and unless its an all out set of race heads 7000 and up i dont polish the intake side.arond the valve gide on a small block i grind into a V big blocks i take it out.its hard to tell you whow to do this job the first set i did i was told to thik of them flowing water.then had a man check them.that was about 150 sets ago.