{"product_id":"yella-terra-holden-6-12-port-alloy-head-74cc-bare-ach-33c74","title":"Yella Terra Holden 6 Blue\/Black 12-Port Alloy Cylinder Head — 74cc Bare — ACH 33C74","description":"\u003cp\u003eACH 33C74 is Yella Terra’s semi-finished 74 cc bare alloy cylinder head for Holden Blue\/Black 12-port inline-six builds. The large chamber and additional deck material give the engine builder flexibility when setting compression and completing the head for a specific combination.\u003c\/p\u003e\u003ch3\u003eBare-head specification\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e74 cc chamber in supplied form; Yella Terra notes the casting can be faced toward approximately 56 cc.\u003c\/li\u003e\n\u003cli\u003eApproximately 0.080 inch additional deck material for machining flexibility.\u003c\/li\u003e\n\u003cli\u003eHeat-treated 356-T6 aluminium construction.\u003c\/li\u003e\n\u003cli\u003eValve seats are supplied rough cut and require final engine-builder machining.\u003c\/li\u003e\n\u003cli\u003eYella Terra quotes approximately 240 hp potential in suitable out-of-box combinations and more than 300 hp with extensive CNC port development.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eBare \/ semi-finished component:\u003c\/strong\u003e Final seat work, guides, clearances, chamber volume, surface finish and valvetrain setup must be completed and verified by the engine builder.\u003c\/p\u003e\u003ch2\u003eSupplier\u003c\/h2\u003e\u003cp\u003eYella Terra\u003c\/p\u003e\u003ch2\u003eProduct System\u003c\/h2\u003e\u003cul\u003e\u003cli\u003eEngine Parts\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSupplier Part Number\u003c\/h2\u003e\u003cp\u003eACH 33C74\u003c\/p\u003e\u003ch2\u003eBuilt by Boost \u0026amp; Tune Support\u003c\/h2\u003e\u003cp\u003eBBT can assist with fitment review, installation, supporting modifications, configuration and calibration requirements where applicable.\u003c\/p\u003e","brand":"Yella Terra","offers":[{"title":"Default Title","offer_id":43817421504579,"sku":"ACH 33C74","price":2450.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/ACH_33C74__86254.1741572343.jpg?v=1789174876","url":"https:\/\/builtbyboostandtune.com.au\/products\/yella-terra-holden-6-12-port-alloy-head-74cc-bare-ach-33c74","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}