GM LS3 6 Bolt 276cc Aeroflow Performance CNC Ported Aluminium Cylinder Heads with 70cc 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 featuring full CNC ports and combustion chambers that produce increased power & torque, improved efficiency, and excellent flow numbers.

These 15° LS3 Rectangle Port heads are designed to fit LS series engines with a 4.00" or larger bore. These bare 276cc heads accept 2.165" diameter intake valves and 1.59" exhaust valves and have a thicker than stock .625" deck thickness. Available in OE 4-bolt design or 6-bolt design to suit standard or LSX block designs.

Thread sealant must be used on all rocker bolts as threads intersect with intake ports.

Specifications:

• Part number: AF95-0416
• Material: A356 Aluminium
• Chamber: 70cc
• Intake Port Volume: 276cc
• Intake Port Dimension: 1.30" x 2.61"
• Exhaust Port Volume: 92cc
• Exhaust Port Dimension: 1.475" H x 1.65" W
• Spark Plug Location: OE Stock
• Intake Valve Diameter: 2.165" x 4.89"
• Exhaust Valve Diameter: 1.59" x 4.89"
• Valve Stem Diameter: 8mm
• Valve Spring Pocket I.D.: 1.30"
• Valve Guide Material: Manganese Bronze
• Valve Guide O.D.: .502" (.560" at base)
• Rocker Design: LS3 Rails required
• Valve Angle: 15°
• Deck Thickness: .625"

Fitment notes:

• We recommend to check installed spring seat pressure & open pressure before installing your cylinder heads to make sure the spring pressure is correct for your application.
• Thread sealant must be used on all rocker bolts as threads intersect with intake ports.