{"product_id":"aluminum-cylinder-head-assembly","title":"Aluminum Cylinder Head Assembly","description":"The Speedmaster PCE281.2165 is a complete aluminum cylinder head designed to enhance the performance of Pontiac 389, 400, and 455 Big Block engines. This assembly boasts a 215cc intake runner volume and a 72cc combustion chamber volume, optimized for a Ram Air IV configuration with hydraulic flat tappet camshafts.\n\nKey specifications include 2.110-inch intake valves and 1.660-inch exhaust valves, supporting a maximum valve lift of 0.58 inches. The head features dual valve springs with a damper spring included, and an oiling style through the pushrod for efficient lubrication. The outside diameter of the outer spring is 1.450 inches.\n\nConstructed from aluminum, these cylinder heads offer a significant weight advantage over cast iron alternatives, aiding in overall vehicle performance and handling.","brand":"Speedmaster","offers":[{"title":"Default Title","offer_id":52663777263928,"sku":"PCE281.2165","price":1690.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687687041.jpg?v=1784329522","url":"https:\/\/store.motormia.co\/products\/aluminum-cylinder-head-assembly","provider":"MOTORMIA","version":"1.0","type":"link"}