Edelbrock Fiber Laminate Spacer for 2945Edelbrock part #8728 spacer kit includes a 7 16" thick spacer and two 3 64" thick gaskets for a total thickness of 1 2". The kit also has new base to upper fasteners to accommodate the spacer. There are several benefits to the kit. First it raises the upper manifold 1 2" for increase valve cover to upper plenum clearance. It also provides heat insulation between the lower and upper manifolds. As a third benefit the 1 2" extra runner length helps to