From what I understand, two things make notching the block for intake valve de shrouding of little value? First, the valve is moving away from the cylinder wall as it opens. Two, the flow on the short side radius of a port is very poor in most cases, although the Apache heads may have the best short side situation of any head on a stock motor. Still, I bet the flow difference would show very little power gain between notched and un notched bores.