{"product_id":"b58-closed-deck-service","title":"B58 Closed Deck Cylinder Head Mod","description":"\u003ch3\u003e\u003cspan\u003e5150 AutoSport B58 Closed Deck Cylinder Head Modification Service\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eHigh horsepower B58 engines are known to experience cylinder head sealing issues due to the coolant jacket design around the combustion chamber. Under extreme cylinder pressure, the factory head flexes and pushes compression into the cooling system, leading to:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003eCooling system over pressurization\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCoolant loss\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHead lift\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHead gasket failure\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUnsafe coolant discharge under racing conditions\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAt 5150 AutoSport, we developed our proprietary B58 Closed Deck Cylinder Head Modification to reinforce the weak areas surrounding the combustion chamber and improve sealing stability in extreme horsepower applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis process is designed for serious high-boost and high-cylinder-pressure builds targeting 1000+ HP applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eOur process includes:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003eExtensive CNC machining\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCustom reinforcement inserts\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePrecision welding\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMulti-stage resurfacing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePressure testing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eProprietary reinforcement procedures\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eUnlike simple insert jobs, our process is engineered to withstand real world heat cycles and extreme cylinder pressure without insert movement or collapse.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis modification has been tested and proven on high-horsepower B58 applications under demanding racing conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBuilt for racers who want reliability, safety, and confidence at extreme power levels.\u003c\/span\u003e\u003c\/p\u003e","brand":"5150 AutoSport","offers":[{"title":"Default Title","offer_id":53344954646835,"sku":"5150-11-CDC-B58","price":6000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/3827\/3587\/files\/Resurfaced-Cylinder-Head-BMW-Toyota-B58.webp?v=1722010541","url":"https:\/\/5150autosport.com\/ja\/products\/b58-closed-deck-service","provider":"5150 AutoSport","version":"1.0","type":"link"}