Every gasket in these kits uses the best materials possible for its intended application Multi-Layer Steel (MLS) head gaskets Steel VitonĀ«-coated base gaskets Blue Viton valve stem seals Aluminum Foam Material (AFM) race-style exhaust gaskets Complete kits include motor gasket kit plus primary, derby and inspection cover gaskets (where applicable) Made in the U.S.A.. GSKT MOTOR1200XL030 91-03