{"product_id":"dart-pro1-cnc-aluminum-big-block-chevy-cylinder-heads-4","title":"Dart 19474030 Pro1 CNC Aluminum Big Block Chevy Cylinder Heads","description":"Maximum performance, bracket racing, heads up and super classes. Over 7,500 RPM, 500+ cubic inches, a great head for maximum effort comp or bracket cars. Dart's PRO2 24 Deg 380cc CNC heads have been revised with larger 2.350 in. intake valves and a revised port design for improved airflow and a substantial horsepower increase! These cylinder heads were designed to make competitive engine building easier and less expensive by incorporating the rugged features of our famous Race Series casting into a ready to use, professional quality competition cylinder head. Every intake port, every exhaust runner, every valve bowl, and every combustion chamber is 100% digitally CNC machined for the ultimate in consistency. Assemblies include Stainless Steel valves, premium springs, locks, retainers, guide plates and seals.","brand":"Dart","offers":[{"title":"Default Title","offer_id":51163604287803,"sku":"BGWK_19474030","price":3995.47,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/5958\/2011\/files\/BBC_PRO1_335-355-365cc-Head-ANG135_ddd2ae22-c384-4696-b80e-eaa79140b6f3.jpg?v=1776120531","url":"https:\/\/performancepartscanada.ca\/products\/dart-pro1-cnc-aluminum-big-block-chevy-cylinder-heads-4","provider":"Performance Parts Canada","version":"1.0","type":"link"}