{"product_id":"complete-small-block-ford-windsor-289-302-351-185cc-cnc-ported-alloy-cy-heads","title":"Complete Small Block Ford Windsor 289 302 351 185cc CNC Ported Alloy Cy Heads","description":"\u003cdiv\u003e\n\u003ch2\u003eUpgrade Pair for Ford Windsor 289–351\u003c\/h2\u003e\n\u003cp\u003eBoost your small-block Ford Windsor build with a complete pair of CNC-ported aluminium cylinder heads designed for street and strip performance. Crafted from rugged A356-T6 aluminium and featuring fully CNC ports and combustion chambers, these heads deliver modern flow characteristics at a price-friendly option. Engineered for idle-to-6500 rpm operation, they unlock impressive efficiency and power from 289–351 cubic inches.\u003c\/p\u003e \u003ch3\u003eWhat makes them unique\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eUltra-smooth A356 aluminium castings with precision CNC ports and combustion chambers\u003c\/li\u003e \u003cli\u003e5-angle competition valve job with hand bowl blending and diamond-honed bronze guides for reliable valve seating\u003c\/li\u003e \u003cli\u003eLarge dual valve springs (1.32\" diameter) to handle up to 0.600\" lift\u003c\/li\u003e \u003cli\u003eDesigned to outperform many premium brands while remaining affordable\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePair of heads for Ford Windsor (289–351)\u003c\/li\u003e \u003cli\u003eMaterial: A356 Aluminium\u003c\/li\u003e \u003cli\u003eChamber: 58cc\u003c\/li\u003e \u003cli\u003eIntake port volume: 185cc\u003c\/li\u003e \u003cli\u003eIntake port dimensions: 2.10\" x 1.25\"\u003c\/li\u003e \u003cli\u003eExhaust port volume: 63cc\u003c\/li\u003e \u003cli\u003eExhaust port dimensions: 1.35\" x 1.35\"\u003c\/li\u003e \u003cli\u003eSpark plug location: OEM\u003c\/li\u003e \u003cli\u003eIntake valve diameter: 2.02\"\u003c\/li\u003e \u003cli\u003eExhaust valve diameter: 1.60\"\u003c\/li\u003e \u003cli\u003eValve stem diameter: 8mm\u003c\/li\u003e \u003cli\u003eValve spring pocket I.D.: 1.55\"\u003c\/li\u003e \u003cli\u003eValve guide material: Manganese Bronze\u003c\/li\u003e \u003cli\u003eValve guide O.D.:.500\" (.560\" at base)\u003c\/li\u003e \u003cli\u003eRocker stud thread size: 7\/16\" x 14\u003c\/li\u003e \u003cli\u003eValve angle: 20°\u003c\/li\u003e \u003cli\u003eSprings and hardware – Installed height: 1.850\"\u003c\/li\u003e \u003cli\u003eInstalled pressure: 125lbs\u003c\/li\u003e \u003cli\u003eOpen pressure: 325lbs @ 500\"\u003c\/li\u003e \u003cli\u003eMaximum lift:.600\" @ 1.160\"\u003c\/li\u003e \u003cli\u003eCoil bind: 1.070\"\u003c\/li\u003e \u003cli\u003eSpring outside diameter: 1.320\" | Inside diameter: 0.680\" | Free length: 2.300\"\u003c\/li\u003e \u003cli\u003eValve spring retainer outside diameter: 1.250\" | Inside diameter: 0.410\"\u003c\/li\u003e \u003cli\u003eValve spring locator outside diameter: 1.400\" | Inside diameter: 1.330\"\u003c\/li\u003e \u003cli\u003eRocker studs compatible with 7\/16\" x 14; drilled for 1\/2\" head bolts\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility \u0026amp; installation notes\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eSuits flat tappet and hydraulic roller camshaft\u003c\/li\u003e \u003cli\u003eDrilled for 1\/2\" head bolts; if using 7\/16\" bolts, a head bolt bushing kit or step-down bolts is required\u003c\/li\u003e \u003cli\u003eImportant: check installed seat pressure and open pressure before installation to ensure correct spring pressure for your application\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eUse cases \u0026amp; performance\u003c\/h3\u003e\n\u003cp\u003eThese complete heads are engineered to maximize performance for street and strip engines within the idle-to-6500 rpm range. They’re especially well-suited for budget-conscious builds that still demand strong air flow and reliable valvetrain performance. Pair these heads with a compatible camshaft and supporting components to achieve improved efficiency, better airflow, and enhanced overall engine response for Ford Windsor builds from 289 through 351 cubic inches.\u003c\/p\u003e \u003ch3\u003eWhat you get\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eComplete pair of CNC-ported aluminium cylinder heads for Ford Windsor (289–351)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"TGM Performance Parts","offers":[{"title":"Default Title","offer_id":47478001336490,"sku":"AF95-2348","price":3596.3,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7829\/4698\/files\/AF95-2348_2.jpg?v=1759285195","url":"https:\/\/tgmperformance.com.au\/products\/complete-small-block-ford-windsor-289-302-351-185cc-cnc-ported-alloy-cy-heads","provider":"TGM Performance Parts","version":"1.0","type":"link"}