Big Block Chev 396-454 320cc Complete 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 new as-cast runner and chamber designs produce excellent flow numbers. This combined with a 5-angle competition valve job, diamond-honed bronze guides, hand bowl blending and professional assembly help to outperform some of the best brands in the business.

These heads flow at 364cfml, and are best suited for high revving 454, or 502ci big blocks. They come complete with larger than stock 1.625" diameter dual valve springs, able to handle up to .850" maximum lift, and suit solid roller camshafts.

The complete heads include intake valves, exhaust valves, valve springs, valve retainers, valve locks, & valve seals.

Specifications:

• Part number: AF95-2427
• 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"

Installed components

• Intake Valves: 2.25" x 5.49" x 11/32", part no. AF59-4271
• Exhaust Valves: 1.88" x 5.42" x 11/32", AF59-4272
• Valve Springs: 1.65" Dual spring, part no. AF59-4273
• Valve Retainers: 10° 11/32", part no. AF59-4274
• Valve Locks: 10° 11/32" part no. AF59-4275
• Valve Seals: 11/32" x .530"

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.
• Guide plates and rocker studs not included
• The installed larger than stock 1.625" diameter dual valve spring to handle up to .850".
• 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