One of the most common porting errors I see on the LT500 is shops making the intake bridge narrow and or putting a knife edge on the bridge.  Modifications like this just shows a lack of understanding of some of the most basic principles in gas dynamics.  Narrowing the bridge just makes it weaker and knife edging actually makes the port act like the port is not as wide as it was before the knife edge shape was created. 

It is very difficult to make someone understand why "Knife edging" does not do what seems like a no brainer.  Unfortunately gas and fluid flow does not always behave like intuition would have us believe.