{"product_id":"dart-iron-eagle-s-s-small-block-chevy-cylinder-heads-4","title":"Dart Iron Eagle S\/S Small Block Chevy Cylinder Heads","description":"Stock replacement, street and strip performance, or towing upgrade with mildly modified engines from idle to 5,500 RPM. Best for 305-383 cubic inch engines. Works with most standard components. Dart Iron Eagle S\/S 23 Deg 165cc heads produce great throttle response and low to mid-range torque for street performance engines. Our precision cast ports and chambers produce outstanding air flow without time consuming porting. Dart S\/S heads are legal in many racing sanctions with Iron head rules. Assemblies include Stainless Steel valves, premium springs, locks, retainers, and seals. Guide plates not included for self-aligning rocker styles.","brand":"Dart","offers":[{"title":"Default Title","offer_id":67609127092392,"sku":"BGWK_10024361","price":394.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0402\/2344\/1064\/files\/10021070-ANG135_85b8011e-078f-41d8-a311-53fc4b7cd533.jpg?v=1791234429","url":"https:\/\/www.truspeedperformance.com\/products\/dart-iron-eagle-s-s-small-block-chevy-cylinder-heads-4","provider":"TruSpeed Performance LLC","version":"1.0","type":"link"}