Chev Corvette 396 454 502 Hooker Competition Sidemount Headers 63-82 LHD # 2222-1HKRChev Corvette 396 454 502 Hooker Competition Sidemount Headers 63 82 # 2222 1HKR Header Style: Side mount Header Material: Steel Primary Tube Outside Diameter (in.): 2 1 8 in. Header Color: Silver ceramic coated Flange Style: Standard Weld Up: No Cylinder Head Port Shape: Round Collector Attachment: Slip fit Collector Diameter (in.): 4. 00 Collector Reducers Included: No Tuned: Yes Primary Tube Gauge: 18 gauge Flange Thickness (in.): 0. 31 in. Bolts