Learn more: https://www.holley.com/products/exhaust/headers_and_exhaust_manifolds/exhaust_manifolds/ Description: If your goal is more power with a classic appearance, Hooker small-block Chevy cast-iron exhaust manifolds are just the ticket. A high-silicone material gives them superior heat resistance characteristics, while a larger cross section allows them to flow better and make more power than a factory manifold.