{"product_id":"small-block-chev-327-350-400-204cc-aluminium-cylinder-heads-pair","title":"Small Block Chev 327-350-400 204cc Aluminium Cylinder Heads Pair","description":"\u003cdiv\u003e\n\u003cp\u003eUnlock street‑and‑strip performance with Aeroflow’s Small Block Chevy 327-350-400 204cc Aluminium Cylinder Heads (Pair). Built from precision‑cast A356‑T6 aluminium, these heads push flow numbers higher thanks to a fresh runner and chamber design, a 5‑angle competition valve job, and hand‑finished details that help them outperform many brands in the same price bracket. The result is impressive idle to 6500 rpm capability with strong mid‑range power for daily driving and weekend sessions alike.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eKey features that set these heads apart\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e204cc intake runners paired with a 67cc combustion chamber for efficient air\/fuel mixture and favorable compression characteristics\u003c\/li\u003e \u003cli\u003eIntake port: 2.22\" x 1.31\" and Exhaust port: 1.34\" x 1.39\" with straight spark plug location for straightforward installation\u003c\/li\u003e \u003cli\u003eValve arrangement and sizing: Intake valve 2.02\" diameter; Exhaust valve 1.60\" diameter; Valve stems 11\/32\"\u003c\/li\u003e \u003cli\u003e23° valve angle designed to improve flow and quench characteristics compared to older designs\u003c\/li\u003e \u003cli\u003eRugged build with Manganese Bronze valve guides and bronze guide honing for durability and reliability\u003c\/li\u003e \u003cli\u003eDeck thickness.625\" for a robust foundation and consistent sealing\u003c\/li\u003e \u003cli\u003eIncludes everything needed for installation: valves, valve springs, retainers \u0026amp; locks, guide plates, and 7\/16\" rocker studs\u003c\/li\u003e \u003cli\u003eDesigned for entry‑level street performance engines to maximize flow while remaining budget‑friendly\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eComplete kit highlights\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eValve springs: larger‑than‑stock dual springs with a 1.43\" (approx.) outer diameter to handle the rigors of higher lift\u003c\/li\u003e \u003cli\u003eValve spring specs: installed height 1.790\", installed pressure 135 psi; open pressure 290 psi @ 500\"; maximum lift 0.540\" @ 1.250\"; coil bind 1.210\"\u003c\/li\u003e \u003cli\u003eSpring dimensions: outside diameter 1.450\", inside diameter 0.700\", free length 2.350\"\u003c\/li\u003e \u003cli\u003eValve spring retainer outside diameter 1.400\"; retainers feature Step 1 1.060\" and Step 2 0.680\"\u003c\/li\u003e \u003cli\u003eValve spring locator outside diameter 1.560\" and inside diameter 0.560\"\u003c\/li\u003e \u003cli\u003eGuide plates and 7\/16\" rocker studs included for quick, reliable setup\u003c\/li\u003e \u003cli\u003eSpark plug location: Straight for straightforward wiring and plug choice\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical specifications at a glance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eMaterial: A356 aluminium\u003c\/li\u003e \u003cli\u003eChamber: 67cc\u003c\/li\u003e \u003cli\u003eIntake port volume: 204cc\u003c\/li\u003e \u003cli\u003eIntake port dimensions: 2.22\" x 1.31\"\u003c\/li\u003e \u003cli\u003eExhaust port volume: 70cc\u003c\/li\u003e \u003cli\u003eExhaust port dimensions: 1.34\" x 1.39\"\u003c\/li\u003e \u003cli\u003eRocker stud thread size: 7\/16\" x 14\u003c\/li\u003e \u003cli\u003eValve guide material: Manganese Bronze; guide O.D..530\" (0.570\" at base)\u003c\/li\u003e \u003cli\u003eMax lift (valve springs): 0.540\" at 1.250\" installed height\u003c\/li\u003e \u003cli\u003eDeck thickness:.625\"\u003c\/li\u003e \u003cli\u003eIntake valve diameter: 2.02\"; Exhaust valve diameter: 1.60\"\u003c\/li\u003e \u003cli\u003eValve stem diameter: 11\/32\"\u003c\/li\u003e \u003cli\u003eValve spring pocket I.D.: 1.49\"\u003c\/li\u003e \u003cli\u003eValve spring locator I.D.: 0.560\"\u003c\/li\u003e \u003cli\u003eFitment: Suitable for bore sizes 4.00\" and larger; supports flat tappet and hydraulic camshafts\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhy choose these heads\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThese Aeroflow aluminium heads are built for drivers who want more flow without sacrificing street manners. The combination of a high‑flow 204cc intake with a compact 67cc chamber delivers improved low‑to‑mid range torque and a potent overall power curve. With premium assembly details and ready‑to‑go components, these heads dramatically reduce setup time and help you realize your engine’s potential on a budget.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eImportant installation note\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBefore final assembly, check installed spring seat pressure and open pressure to ensure it matches your camshaft and drivetrain requirements. This step helps guarantee optimal valve train performance and reliability for your specific application.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"TGM Performance Parts","offers":[{"title":"Default Title","offer_id":47477505360042,"sku":"AF95-2350","price":2255.4,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7829\/4698\/files\/AF95-2327_3.jpg?v=1759279212","url":"https:\/\/tgmperformance.com.au\/products\/small-block-chev-327-350-400-204cc-aluminium-cylinder-heads-pair","provider":"TGM Performance Parts","version":"1.0","type":"link"}