The Cylinder Head "Hardlock" Kit contains 4 sets of Hardlock nuts - "the most secure fastening nut", and 4 pieces of M8 1mm washers.
The Hardlock nuts will not loosen under any heat or vibration conditions, making it great for securing cylinder head for higher powered engines such as our ZR28 Racing.
Please note that the Hardlock kit requires the longer 90mm cylinder head studs.
