Unique 1 piece head shell design, uses stock studs. Completely o'ringed, no head gasket. Includes stainless acorn nuts, washers, & o'ring washers. Increased cooling capacity. 90 degree elbow on intake side allows for boost bottles. Clear anodized for protection against corrosion. Includes billet head shell, OR046 & OR024 orings, 8mm acorn nuts, 8mm flat washers, & oring washers. Order domes below under Related Products.