Pontiac 326 350 389 400 428 455 MID-AIR™ MidRise Aluminum Intake Manifold [Satin] They are manufactured from steel

They are manufactured from steel and are chrome plated for protection against corrosion

Benefit from an easy installation and gain in horsepower

These camshafts are precision-ground from race-quality cores

Give your battery extra protection and reduce underhood clutter with Speedmaster rugged fabricated aluminum battery boxes

Speedmaster chrome breathers keep your crankcase properly vented and add a little shine under the hood

Pontiac 326 350 389 400 428 455 MID-AIR™ MidRise Aluminum Intake Manifold [Satin] They are manufactured from steelThis is an outstanding manifold for high performance street Pontiac engines. Unlike similar competitive manifolds, the MidRise Air from Speedmaster allows unlimited ambient air flow under the plenum and around the runners which helps create a cooler incoming air fuel charge which produces additional power..