{"product_id":"complete-small-block-ford-windsor-289-302-351-175cc-alloy-cyl-heads","title":"Complete Small Block Ford Windsor 289 302 351 175cc Alloy Cyl Heads","description":"\u003cdiv\u003e\n\u003ch2\u003eComplete Aeroflow 175cc Aluminium Cylinder Heads for Ford Windsor (289-351)\u003c\/h2\u003e\n\u003cp\u003eUnlock street‑and‑strip performance from your Ford Windsor with a complete pair of Aeroflow 175cc aluminium cylinder heads. Crafted from premium A356‑T6 aluminium, these heads are built for efficient flow, durability, and a budget‑friendly price point. Designed to shine from idle up through mid‑range RPM, they’re a practical upgrade for 289–351 small‑block builds seeking real torque and strong, reliable operation.\u003c\/p\u003e \u003ch3\u003eWhy these heads stand out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePremium material: A356‑T6 aluminium delivers light weight with robust durability.\u003c\/li\u003e \u003cli\u003eConsistent flow and sealing: 61cc combustion chamber, 175cc intake port volume, and 66cc exhaust port volume between the heads for balanced power across the range.\u003c\/li\u003e \u003cli\u003ePrecise porting and combustion: 5‑angle competition valve job, diamond‑honed bronze valve guides, hand bowl blending, and professional assembly for improved flow and reliability.\u003c\/li\u003e \u003cli\u003eAccessibility and sealing: Angled spark plug location to enhance accessibility across various header configurations.\u003c\/li\u003e \u003cli\u003eBalanced valve train: Intake valve 2.02\" and exhaust valve 1.60\" with 11\/32\" valve stems and manganese bronze guides.\u003c\/li\u003e \u003cli\u003eRocker\/valve train hardware: 7\/16\" x 14 rocker stud threads for solid adjustability.\u003c\/li\u003e \u003cli\u003e stout valve springs: Larger‑than‑stock springs with 1.440\" OD, 1.130\" ID, installed height 1.800\", installed pressure 125 psi, open pressure 300 psi at 500\" of lift; capable of up to ~0.525\" lift (max 0.600\" @ 1.200\").\u003c\/li\u003e \u003cli\u003eFull hardware package: Retainers (outside 1.400\", inside 0.395\"), two retainer steps (1.060\" and 0.685\"), locator (1.550\" OD, 0.565\" ID).\u003c\/li\u003e \u003cli\u003eDeck design for sealing: 0.625\" deck thickness to promote proper quench and sealing characteristics.\u003c\/li\u003e \u003cli\u003eCam compatibility: drilled for 1\/2\" head bolts; for 7\/16\" bolts, a head bolt bushing kit or step‑down bolts is recommended.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eApplications: Small Block Ford Windsor 289–351\u003c\/li\u003e \u003cli\u003eChamber size: 61cc\u003c\/li\u003e \u003cli\u003eIntake port volume: 175cc\u003c\/li\u003e \u003cli\u003eIntake port dimension: 2.00\" x 1.18\"\u003c\/li\u003e \u003cli\u003eExhaust port volume: 66cc\u003c\/li\u003e \u003cli\u003eExhaust port dimension: 1.32\" x 1.27\"\u003c\/li\u003e \u003cli\u003eSpark plug location: Angled\u003c\/li\u003e \u003cli\u003eIntake valve: 2.02\" diameter\u003c\/li\u003e \u003cli\u003eExhaust valve: 1.60\" diameter\u003c\/li\u003e \u003cli\u003eValve stems: 11\/32\"\u003c\/li\u003e \u003cli\u003eValve guides: Manganese Bronze, O.D. 0.530\" (base 0.570\")\u003c\/li\u003e \u003cli\u003eRocker stud thread: 7\/16\" x 14\u003c\/li\u003e \u003cli\u003eValve angle: 20°\u003c\/li\u003e \u003cli\u003eDeck thickness: 0.625\"\u003c\/li\u003e \u003cli\u003eSpring data: Installed height 1.800\" • Installed pressure 125 psi • Open pressure 300 psi @ 500\" lift\u003c\/li\u003e \u003cli\u003eSpring outer diameter: 1.440\" • Inner diameter: 1.130\"\u003c\/li\u003e \u003cli\u003eFree length: 2.200\"\u003c\/li\u003e \u003cli\u003eMaximum lift: 0.600\" @ 1.200\" (capable up to ~0.525\" lift)\u003c\/li\u003e \u003cli\u003eValve spring retainers: Outside diameter 1.400\" • Inside diameter 0.395\"\u003c\/li\u003e \u003cli\u003eRetainer steps: Step 1 1.060\" • Step 2 0.685\"\u003c\/li\u003e \u003cli\u003eSpring locator: Outside diameter 1.550\" • Inside diameter 0.565\"\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eInstallation and build considerations\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eThese heads are drilled for 1\/2\" head bolts. If you’re using 7\/16\" bolts, you’ll want a head bolt bushing kit or step‑down bolts to ensure proper fit and seal.\u003c\/li\u003e \u003cli\u003eCheck installed spring seat pressure and open pressure before installation to ensure correct spring pressure for your specific application.\u003c\/li\u003e \u003cli\u003eDesigned to pair with flat tappet cams and tuned for reliable performance across idle to mid‑range RPM, up to the 6500 rpm window in typical street builds.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat this means for your build\u003c\/h3\u003e\n\u003cp\u003eThis pair of 175cc Aeroflow heads is engineered to deliver solid street performance with competitive flow across the idle‑to‑6500 rpm window. Expect improved low‑ to mid‑range torque, refined response, and dependable sealing characteristics thanks to a precise 61cc final chamber, optimized port geometry, and meticulous assembly. The angled spark plugs, enhanced valve train hardware, and robust valve springs give you the flexibility to tune for daily driving, weekend drag sessions, or a balanced street\/strip setup without breaking the bank.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"TGM Performance Parts","offers":[{"title":"Default Title","offer_id":47477964570794,"sku":"AF95-2302","price":2255.4,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7829\/4698\/files\/AF95-2302_2.jpg?v=1759283695","url":"https:\/\/tgmperformance.com.au\/products\/complete-small-block-ford-windsor-289-302-351-175cc-alloy-cyl-heads","provider":"TGM Performance Parts","version":"1.0","type":"link"}