{"product_id":"complete-small-block-ford-windsor-289-302-351-185cc-alloy-cyl-heads","title":"Complete Small Block Ford Windsor 289 302 351 185cc Alloy Cyl Heads","description":"\u003cdiv\u003e\n\u003ch2\u003eAeroflow Complete Small Block Ford Windsor 289-351 185cc Aluminium Cylinder Heads (Pair)\u003c\/h2\u003e\n\u003cp\u003eUnlock street‑and‑strip power for your Ford Windsor with Aeroflow’s 185cc aluminium cylinder heads. Cast from smooth A356‑T6 aluminium, these heads shave weight and boost flow to deliver stronger mid‑range torque and higher top‑end power—all while staying wallet‑friendly. Optimized for idle to 6500 rpm, they’re a versatile upgrade for 289‑351 Windsor builds that crave performance without the premium price.\u003c\/p\u003e \u003ch3\u003eKey advantages\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eHigh‑flow 185cc intake ports paired with a 58cc combustion chamber for a balanced power band\u003c\/li\u003e \u003cli\u003eAluminium: A356‑T6 casting for lightweight strength and durability\u003c\/li\u003e \u003cli\u003eIntake Port Dimension: 2.10 in. x 1.25 in.; Exhaust Port Dimension: 1.35 in. H x 1.35 in. W\u003c\/li\u003e \u003cli\u003eChamber Volume: 58cc; Intake Port Volume: 185cc; Exhaust Port Volume: 58cc\u003c\/li\u003e \u003cli\u003eIntake Valve Diameter: 2.02 in.; Exhaust Valve Diameter: 1.60 in.; Valve Stem Diameter: 8 mm\u003c\/li\u003e \u003cli\u003eRocker Stud Thread Size: 7\/16 in. x 14; Valve Angle: 20°\u003c\/li\u003e \u003cli\u003eDeck Thickness: 0.750 in.\u003c\/li\u003e \u003cli\u003eDesigned for street and race engines to deliver maximum flow at a budget price\u003c\/li\u003e \u003cli\u003eCam compatibility: Suits flat tappet and hydraulic roller camshafts\u003c\/li\u003e \u003cli\u003eSpark Plug Location: OEM\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eValve gear and spring details\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eValve Spring Pocket I.D.: 1.55 in.\u003c\/li\u003e \u003cli\u003eValve Guide Material: Manganese Bronze; Valve Guide O.D.: 0.500 in. (0.560 in. at base)\u003c\/li\u003e \u003cli\u003eValve Spring Specifications: \u003cul\u003e \u003cli\u003eInstalled Height: 1.840 in.\u003c\/li\u003e \u003cli\u003eInstalled Pressure: 125 psi\u003c\/li\u003e \u003cli\u003eOpen Pressure: 310 psi @ 0.500 in lift\u003c\/li\u003e \u003cli\u003eMaximum Lift: 0.680 in. @ 1.160 in.\u003c\/li\u003e \u003cli\u003eCoil Bind: 1.070 in.\u003c\/li\u003e \u003cli\u003eSpring Outside Diameter: 1.320 in.\u003c\/li\u003e \u003cli\u003eSpring Inside Diameter: 0.675 in.\u003c\/li\u003e \u003cli\u003eSpring Free Length: 2.300 in.\u003c\/li\u003e \u003cli\u003eValve Spring Retainer Outside Diameter: 1.250 in.\u003c\/li\u003e \u003cli\u003eValve Spring Inside Diameter: 0.410 in.\u003c\/li\u003e \u003cli\u003eValve Spring Retainer Step 1: 0.880 in.; Step 2: 0.650 in.\u003c\/li\u003e \u003cli\u003eValve Spring Locator Outside Diameter: 1.615 in.; Inside Diameter: 0.565 in.\u003c\/li\u003e \u003c\/ul\u003e \u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation notes\u003c\/h3\u003e\n\u003cp\u003eThese heads are designed for both street and race applications to maximize flow without a premium price tag. They are compatible with flat tappet and hydraulic roller camshafts. Heads are drilled for 1\/2 in. head bolts; if you plan to use 7\/16 in. bolts, a head bolt bushing kit or step‑down bolts is required. Aeroflow provides a 1\/2 in. bolt compatibility note and recommends checking installed spring seat pressure and open pressure before installation to ensure the spring pressure matches your specific application.\u003c\/p\u003e \u003ch3\u003eWhat this means for your Windsor build\u003c\/h3\u003e\n\u003cp\u003ePair these 185cc aluminium heads with your Ford Windsor 289‑351 to achieve a well‑rounded setup that improves mid‑range torque and boosts top‑end power. The combination of efficient port sizing, compact chamber volume, and robust valve gear makes them a reliable upgrade for both daily drivers and track‑tuned engines, all while keeping installation practical and affordable.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"TGM Performance Parts","offers":[{"title":"Default Title","offer_id":47477974663338,"sku":"AF95-2347","price":2311.9,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7829\/4698\/files\/AF95-2347_2.jpg?v=1759284262","url":"https:\/\/tgmperformance.com.au\/products\/complete-small-block-ford-windsor-289-302-351-185cc-alloy-cyl-heads","provider":"TGM Performance Parts","version":"1.0","type":"link"}