{"product_id":"yella-terra-holden-6-road-racer-68cc-bare-alloy-head-ach-33c68","title":"Yella Terra Holden 6 Road Racer 12-Port Alloy Cylinder Head — 68cc Bare — ACH 33C68","description":"\u003cp\u003eYella Terra’s ACH 33C68 Road Racer is a semi-finished high-compression 68 cc alloy 12-port head developed for Holden inline-six performance builds. The supplier lists it for Blue\/Black 202 applications and notes it can be adapted to earlier Red 149–202 engines with the required block modifications.\u003c\/p\u003e\u003ch3\u003eRoad Racer specification\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e68 cc combustion chambers.\u003c\/li\u003e\n\u003cli\u003eApproximately 82 cc intake-runner volume.\u003c\/li\u003e\n\u003cli\u003eApproximately 71 cc exhaust-runner volume.\u003c\/li\u003e\n\u003cli\u003e356-T6 aluminium construction.\u003c\/li\u003e\n\u003cli\u003eRough-cut valve seats for final engine-builder machining.\u003c\/li\u003e\n\u003cli\u003e7\/16-inch screw-in rocker-stud provision.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e Designed around Holden 202 Blue\/Black 12-port architecture; earlier Red motor installations require confirmation of the block modifications, manifold and valvetrain combination.\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 33C68\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":43817422946371,"sku":"ACH 33C68","price":2450.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/0659\/4883\/files\/IMG_7716__49076.1656997263.jpg?v=1789174882","url":"https:\/\/builtbyboostandtune.com.au\/products\/yella-terra-holden-6-road-racer-68cc-bare-alloy-head-ach-33c68","provider":"BUILT BY BOOST AND TUNE","version":"1.0","type":"link"}