There are two common header bolts used to replace the stock studs on your clone, predator or Tillotson engines, 25mm, and 30mm.

These 25mm long bolts are used for standard flange headers, not the “thick” flanges used on some headers.

These Header bolts are predrilled and come with safety wire to prevent the bolts from backing out. This is required for all sanctioning bodies to pass safety tech before being allowed to on track.

Kits Includes:

– 8MX25 Socket Cap Head Bolts – Drilled

– Lock Washers

– Safety Wire