{"product_id":"z304da-assembled-aluminum-cylinder-head","title":"Z304DA Assembled Aluminum Cylinder Head","description":"The Ford Performance M-6049-Z304DA cylinder head is an assembled unit cast from prime A356 T6 aluminum, engineered for enhanced airflow and performance in Ford 302-351W engines.\n\nThese \"Z\" heads feature high-flow ports, CNC-machined 63cc combustion chambers, and a 20-degree inline valve design. The intake ports measure 204cc and exhaust ports measure 85cc, utilizing steel alloy intake and exhaust valve seats. Manganese-bronze valve guides are installed with a semi-finished I.D., and the heads accept both tapered seat and gasket-style 14mm spark plugs. Valve spring specifications include 145 lbs. of pressure at 1.80 in. closed and 358 lbs. at 1.175 in. open.\n\nThis cylinder head requires a competition valve job and bowl blending. It also necessitates .150” offset intake rocker arms, and users should check intake manifold port alignment as not all manifolds will fit due to the size and location of the ports. For valve lifts past approximately .600” to .625”, shaft rockers may be required.","brand":"Ford Performance","offers":[{"title":"Default Title","offer_id":52688405070136,"sku":"M6049Z304DA","price":1049.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/663686791.jpg?v=1784889657","url":"https:\/\/store.motormia.co\/products\/z304da-assembled-aluminum-cylinder-head","provider":"MOTORMIA","version":"1.0","type":"link"}