Dave: Thanks for all the feedback. My valve cones look like a hybrid of the 3 hole and continuously variable type. There are 3 holes but there also grooves in the side of the cone. It may not work but I decided to give it a shot. All of the orifices have been swapped out except for the rotisserie, for the life of me I cannot find where it is.
Do you or does anyone else know where Weber has the orifice for the rotisserie on the Summit S-670.
I have a NG manifold from a 6 burner summit serial # EZ 460555 if your LG is compatible with my grill ill swap with you