Gasket Set, Intake Manifold w/Square Port Only, 2-Piece, 1966-69 AMC V8P N: G 800 American Performance's intake manifold gaskets offer precise sealing to make more power! Properly sealing an engine is vital to making maximum horsepower, and these intake gaskets will allow for optimum flow and performance! Synthetic fiber composite gaskets are impervious to most chemicals, and when compressed, will conform to any imperfections on the sealing surface. A nitrile bead around each port opening makes the seal better, while