{"product_id":"vortec-5-7l-cylinder-head-set","title":"Vortec 5.7L Cylinder Head Set","description":"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.\n\nKey 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.\n\nIt 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.","brand":"Vortec","offers":[{"title":"Default Title","offer_id":52688586768696,"sku":"12558062","price":242.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/662665039.jpg?v=1784891456","url":"https:\/\/store.motormia.co\/products\/vortec-5-7l-cylinder-head-set","provider":"MOTORMIA","version":"1.0","type":"link"}