Hooker Competition Headers Full-Length Steel Pontiac 326 - 455 Pair # 4901HKRHooker Competition Headers Full Length Steel Pontiac 326 455 Pair # 4901HKR Headers, Competition, Long Tube, Steel, Painted, Pontiac, 326 455, Pair Header Style: Long tube one piece Header Material: Steel Primary Tube Outside Diameter (in.): 1 5 8 in. Header Color: Temporary non high temperature paint Flange Style: Standard Weld Up: No Cylinder Head Port Shape: D port Collector Attachment: 3 bolt flange Collector Diameter (in.): 3. 00 Collector