Vortec 5.7L Cylinder Head Set

The GM Performance 12558062 cylinder heads are new, cast iron replacements designed specifically for MerCruiser 5.7L / 350 Vortec marine applications. This set includes stainless steel valves, featuring 1.940" intake and 1.500" exhaust diameters, aimed at improving airflow and performance. Key specifications include a 64cc combustion chamber volume, 170cc intake port volume, and 87cc exhaust port volume. They are supplied as a pair and are backed by a Limited One-Year Warranty. It is important to note that these Vortec heads require a Vortec-specific intake manifold, which may necessitate a low-rise air cleaner to address potential hood clearance issues. While often compared to older 'camel hump' heads, these Vortec castings offer improved flow and a more modern combustion chamber design, making them a solid choice for rebuilding or upgrading a 5.7L 350 Vortec engine.