Complete Small Block Chev 327-350-400 213cc CNC Ported Aluminium Cylinder Heads with 68cc Chamber (Pair)

2.15" x 1.30" Intake Port, 1.45" x 1.50" Exhaust Port

The Aeroflow Series of Aluminium Cylinder Heads are taking affordable performance street and strip cylinder heads to the next level. These heads utilise ultra-smooth A356-T6 aluminium castings, 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.

The Aeroflow Performance small block Chevy cylinder heads are designed for street / race performance engines to give the ultimate in flow at a competitive price. Made from A356-T6 aluminium castings, these 213cc cylinder heads feature full CNC ports and are ideal for operating in the idle to 7500 rpm range. These complete cylinder heads will fit a 4.00" bore and larger. They include larger then stock 1.57" diameter dual valve spring to handle up to .625" maximum lift. Suits mechanical and hydraulic roller camshafts.

Head Specifications

Material:  A356 Aluminium
Chamber Chamber:  68cc
Intake Port Volume:  213cc
Intake Port Dimension:  2.15" x 1.30"
Exhaust Port Volume:  82cc
Exhaust Port Dimension:  1.45" H x 1.50" W
Spark Plug Location:  Angled
Intake Valve Diameter:  2.08"
Exhaust Valve Diameter:  1.60"
Valve Stem Diameter:  8mm
Valve Spring Pocket I.D.:  1.57"
Valve Guide Material:  Manganese Bronze
Valve Guide O.D.:  .502" (.560" at base)
Rocker Stud Thread Size:  7/16" x 14
Valve Angle:  23°
Deck Thickness:  .625"

Valve Spring Specifications

Installed Height: 1.990"
Installed Pressure: 195lbs
Open Pressure: 450lbs @ 500"
Maximum Lift: .750" @ 1.240"
Coil Bind: 1.180"
Spring Outside Diameter: 1.565"
Spring Inside Diameter: 0.795"
Spring Free Length: 1.470"
Valve Spring Retainer Outside Diameter: 1.500"
Valve Spring Inside Diameter: 0.475"
Valve Spring Retainer Step 1: 1.120"
Valve Spring Retainer Step 2: 0.705"
Valve Spring Locator Outside Diameter: 1.620"
Valve Spring Locator Inside Diameter: 0.565"

Suggested Components

Head Gasket:  Fel-Pro 1003
Intake Gasket (1.30 x 2.15 Port Size):  Fel-Pro 1206
Exhaust Gasket (1.45 x 1.50 Port Size):  Fel-Pro 1405
Head Bolts:  ARP 134-3601 or 134-3701
Head Studs:  ARP 134-4001 or 234-4301
Spark Plugs (14mm x 3/4" reach with flat gasket seat):  Champion RC9YC

Installed Components

Intake Valves:  2.08" x 5.00" x 8mm
Exhaust Valves:  1.60" x 5.03" x 8mm
Valve Springs:  1.57" Dual spring
Valve Retainers:  10°8mm
Valve Locks:  10° 8mm
Valve Seals:  8mm x .502" Viton
Rocker Arm Studs:  7/16"-14 x 7/16"-24, AF59-3506
Push Rod Guide Plates:  5/16" Flat, part no. AF59-3507

IMPORTANT NOTICE:

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.