Modular Head Shop - Head Cooling Mod
These Mod Motors are known for having cylinder 8 as a hot spot, leaving it susceptible to detonation, especially with aggressive tuning. Head Cooling Mods (HCM) are designed to allow better flow to cylinder 8, thus preventing abnormally high risk of detonation.
Installation is quite simple, just remove the freeze plugs in the rear of the cylinder head and press in (1 bolt used to fasten) each manifold and connect hoses between the two. These head cooling mods contain high quality o-rings to prevent leaking and use a bolt to secure them from falling out.