Big Block Chev 396-454 320cc Aeroflow Performance Aluminium Cylinder Heads with 120cc Chamber (Pair)

Aeroflow has become synonymous with premium quality performance products. Aeroflow's objective has been to incorporate state-of-the-art manufacturing, aerospace quality materials and rigid quality controls to produce quality performance products at extraordinary value. Aeroflow has taken its forward thinking knowledge to the street, manufacturing a wide range of race quality products to improve street performance and dependability.

The cylinder head sits on top of the engine and seals the top of the engine’s cylinders creating the combustion chamber – the place where the fuel and air mixture is burned. The passages in the cylinder head – known as the ports, allow for air and fuel to flow into the cylinder and exhaust gases to flow out of it. The head also channels coolant into the engine block, cooling down the engine components. It’s also the housing for the valve gear, springs, lifters, and spark plugs.

Most OEM cylinder heads are made from cast iron which is durable and cheap to manufacture, but heavier and not efficient at dissipating heat.

The Aeroflow Performance aluminium cylinder heads utilise high-quality ultra-smooth A356-T6 aluminium castings and new as-cast runner and chamber designs that produce increased power & torque, improved efficiency, and excellent flow numbers.

Designed for both street and race performance engines, the 5-angle competition valve job, diamond-honed bronze guides, hand bowl blending and professional assembly help the Aeroflow series of aluminium cylinder heads to outperform some of the best brands in the business.

These heads flow up to 345cfml, and are best suited for high revving 454 or 502ci up big blocks. These rectangular port 320cc cylinder heads are ideal for operating in the idle to 6750rpm range.

Specifications:

• Part number: AF95-0427
• Material: A356-T6 Aluminium
• Chamber: 120cc
• Intake Port Volume: 320cc
• Intake Port Dimension: 2.45" x 1.75"
• Exhaust Port Volume: 125cc
• Exhaust Port Dimension: 1.75" H x 2.00" W
• Exhaust Port Location: Raised .375"
• Spark Plug Location: Angled
• Intake Valve Diameter: 2.25"
• Exhaust Valve Diameter: 1.88"
• Valve Stem Diameter: 11/32"
• Valve Spring Pocket I.D.: 1.735"
• Valve Guide Material: Manganese Bronze
• Valve Guide O.D.: .530" (.570" at base)
• Rocker Stud Thread Size: 7/16" x 14
• Valve Angle: 24° Intake / 15° Exhaust
• Deck Thickness: .750"

 

Fitment notes:

• It’s recommended to check the installed spring seat pressure & open pressure before installing your cylinder heads to make sure the spring pressure is correct for your application.
• Suggested Components
  • Head Gasket (Mark IV): Fel-Pro 1017-1
  • Intake Gasket (2.45 x 1.75 Port Size): Fel-Pro 1275
  • Exhaust Gasket (1.75 x 2.00 Port Size): Fel-Pro 1411
  • Head Bolts (Mark IV): ARP 135-3610
  • Head Studs: ARP 235-4018
  • Spark Plugs (14mm x 3/4" reach with flat gasket seat): Champion RC9YC