Plastic-This part appears different than original part, but will fit apps listed. One Ready-to-Install Engine Intake Manifold w/ Gaskets & O-Rings. Alternator Mount: No; EGR Ready: Yes; Engine: 4.8 - 5.3 - 6.0; Heated Choke Port: No; HEI Distributer: No; High-Riser: No; Manifold Height (in): 11; Number Of Ports: 8; Plenum Style: Single Plane; Port Outlet Dimensions: 25x81mm; ; One Piece; Designed specifically to work with Dorman OE Solutions Intake Manifold Gaskets only. Learn More