Compare Maximum number of 4 items selected ACDelco M8 Thread Hex Cylinder Head Bolt - 11547584 Part #: 11547584 Line: ACD ACDelco M8 Thread Hex Cylinder Head Bolt 1 Year Limited Warranty Head Size (in): 1/2 Inch Head Size (mm): 13mm Head Type: Hex Thread Size: M8 Material: Steel Show More Show Less