{"product_id":"vortec-cast-iron-cylinder-head","title":"Vortec Cast Iron Cylinder Head","description":"The Chevrolet Performance Vortec cylinder head is a high-performance cast iron component engineered for 1958 and later small block Chevy engines. This head boasts a 170cc intake runner volume and 64cc combustion chambers, optimized for improved airflow and combustion efficiency. The valve sizes are 1.94 inches for intake and 1.5 inches for exhaust, designed to work with a maximum lift.\n\nThis specific part number, 12558060, is often associated with the L31 Vortec engine family and is known to provide a significant horsepower and torque increase over earlier cast iron cylinder heads. Sources indicate a potential gain of 20 to 40 horsepower. The head is assembled and ready for installation on 5.7L V8 engines, such as those found in GM 350 Chevy Pickups from 1996-2002.","brand":"Chevrolet Performance","offers":[{"title":"Default Title","offer_id":52687374319928,"sku":"12558060","price":437.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/660192225.jpg?v=1784883416","url":"https:\/\/store.motormia.co\/products\/vortec-cast-iron-cylinder-head","provider":"MOTORMIA","version":"1.0","type":"link"}