Performer Spacer Kit 8727 Edelbrock 1/2in 4 Hole Intake Manifold Spacer Edelbrock Intake Manifold Spacer Provide heat insulation between the upper and lower manifolds for a cooler charge and more power , It is 0., 5 in thickness Edelbrock Wood Fiber Laminate Base to Upper Spacer Plate Kit for Performer and Performer RPM 5.0 Manifolds (86-95 5.0L Mustang)Find parts that fit my vehicle Fits Edelbrock manifolds #3821 and #7126 Edelbrock Wood Fiber Laminate 1/2 Base to Upper Spacer Plate kit for Performer and Performer RPM 5.0 Manifolds PN's 3821 and PN 7126. Includes spacer plate, gaskets, and bolts. Used to increase valve cover to upper plenum clearance. There are several benefits to the kit The Edelbrock Wood Fiber Laminate Spacer provides heat insulation between the upper and lower manifolds for a cooler charge and more power., It is 0., 5 in thickness. Edelbrock 8727 Intake Plenum Spacer, Phenolic, Edelbrock Performe Kit includes everything, which is necessary for 5., 0L / 5., 8L Ford