Your thinking about the differences on VH41 vs VH45.agentandy wrote:unfortunatly that is still being quite vauge.for example I see there is a difference in the vtc hump on the valve cover. one has a solonoid on it on some dont? some have a little insert in the side of the valve cover that runs front to back, some dont. I have seen one with the altanator between the v and some with it on the side.any help?