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ARP 400-1112 Header Bolt & Stud Kit for Chevrolet Big Block. 1.000˝ UHL ymm_37 remapping the ECU is mandatory ymm_23
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ARP 400 1112 Header Bolt & Stud Kit for Chevrolet Big Block. 1.000˝ UHL ymm_37 remapping the ECU is mandatory ymm_23 remapping the ECU is mandatory in order to prevent potential “check engine light” warning signals Galaxie 1970 1974 000˝ Thread Size 3 8˝ washers included Specifications Socket Size(s) 3 8 hex UHL (Qty: 16) 1
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