Ok, so from everything I have read on porting these OHV engines the focus on the intake side is definitely on smoothing the corner short side radius and then grinding down the valve guide that is protruding into the intake. Then smooth things out, but not too much so as to still allow the fuel to atomize on its way in. Smooth down the edge around the valve seat so that the seat blends smoothly into the bowl for both the intake and exhaust, and then smooth out to a mirror finish the exhaust port. Now after starting to attempt this for the first time I finally see what people mean when they say short side radius (without pointing it out the explanation does not provide much to the average individual. Now, I logically can understand why the work on the short side radius is beneficial for flow in that is allows for an easier and smoother path of travel for the air/fuel mix on its way in without a sharp corner or obstruction of the valve guide. However, what I don't understand is, if this makes sense for improving flow on the way in (intake), why would it not also make sense for the exhaust gases on their way out? Why would you not also want to smooth out the short side radius on the way out? Is it what way the gases enter/travel down the ports?