{"product_id":"5-7l-hemi-cnc-ported-cylinder-heads","title":"5.7L HEMI CNC Ported Cylinder Heads","description":"The Modern Muscle Performance 5.7L HEMI CNC Ported Heads represent a precision-machined solution for 2003-2008 5.7L HEMI engines, replacing stock components with high-flow CNC-ported intake and exhaust ports. Each unit undergoes hand blending of the bowls and a multi-angle valve job to ensure consistent, high-performance results. The assembly includes new seals, shims, and moly retainers, and comes standard with PSI 1511 springs, with an optional upgrade to PSI 1516 springs available.\n\nThis product is ported to order with an estimated 3-5 week lead time. Customers must either send in their own 5.7L HEMI heads for reworking or select a core charge option at the time of purchase. Please note that users should check local and state laws regarding emissions compliance before installation.","brand":"Modern","offers":[{"title":"Default Title","offer_id":52689272078648,"sku":"MMP-5703CNCHD","price":2199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687391708.jpg?v=1784904381","url":"https:\/\/store.motormia.co\/products\/5-7l-hemi-cnc-ported-cylinder-heads","provider":"MOTORMIA","version":"1.0","type":"link"}