This Chevrolet Factory Bow Tie part is the best stock cast iron
4 barrel cast iron intake manifold available
In stock form this Chevrolet cast iron intake manifold will produce more power between 4500 and 7000 rpm than any other stock Chevy cast iron intake manifold. Commonly referred to as a “Marine” intake, this manifold is a cast iron copy of a Z-28 high rise aluminum intake. This "Marine" cast iron intake is equipped with both carburetor bolt patterns, is 1.250" taller than regular intakes and was not available – in cast iron form – on any production cars.