{"product_id":"dart-pro1-cnc-aluminum-big-block-chevy-cylinder-heads-3","title":"Dart 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":67609156747432,"sku":"BGWK_19574030","price":2497.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0402\/2344\/1064\/files\/BBC_PRO1_335-355-365cc-Head-ANG135_d2ab48fd-bbf0-4463-bea4-4b63ced21334.jpg?v=1791235415","url":"https:\/\/www.truspeedperformance.com\/products\/dart-pro1-cnc-aluminum-big-block-chevy-cylinder-heads-3","provider":"TruSpeed Performance LLC","version":"1.0","type":"link"}