Aeroflow Complete SB Ford Windsor 289-351 203cc Cylinder Heads 58cc Chamber Pair

Complete Small Block Ford Windsor 289-351 203cc Aluminium Cylinder Heads with 58cc Chamber (Pair)
2.13" x 1.28" Intake Port, 1.40" x 1.40" Exhaust Port

The Aeroflow Series of Aluminium Cylinder Heads are taking affordable performance street and strip cylinder heads to the next level. These heads utilize 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 Ford Windsor cylinder heads are designed for street / race performance engines to give the ultimate in flow at a budget price. Made from A356 aluminium castings the 203cc cylinder heads are ideal for operating in the idle to 7500 rpm range. The complete heads include larger than stock 1.575" diameter dual valve spring to handle up to .710" maximum lift. Suits hydraulic roller camshaft.

Note: These heads are drilled for 1/2" head bolts. If using a 7/16" bolt, you must use a head bolt bushing kit or step down head bolts.

Head Specifications

Material: A356 Aluminium
Chamber: 58cc
Intake Port Volume: 203cc
Intake Port Dimension: 2.13" x 1.28"
Exhaust Port Volume: 71cc
Exhaust Port Dimension: 1.40" H x 1.40" W
Spark Plug Location: OEM
Intake Valve Diameter: 2.08"
Exhaust Valve Diameter: 1.60"
Valve Stem Diameter: 8mm;
Valve Spring Pocket I.D.: 1.64"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .490" (.560" at base)
Rocker Stud Thread Size: 7/16" x 14
Valve Angle: 20°
Deck Thickness: .750"

Valve Spring Specifications

Installed Height: 2.040"
Installed Pressure: 175lbs
Open Pressure: 425lbs @ 500"
Maximum Lift: .790" @ 1.250"
Coil Bind: 1.190"
Spring Outside Diameter: 1.565"
Spring Inside Diameter: 0.790"
Spring Free Length: 2.480"
Valve Spring Retainer Outside Diameter: 1.500"
Valve Spring Inside Diameter: 0.465"
Valve Spring Retainer Step 1: 1.120"
Valve Spring Retainer Step 2: 0.705"
Valve Spring Locator Outside Diameter: 1.615"
Valve Spring Locator Inside Diameter: 0.565"

Suggested Components

Head Gasket: Fel-Pro 1011-1
Intake Gasket (1.28" x 2.13" Port Size): Fel-Pro 1262
Exhaust Gasket (1.40" x 1.40" Square Port Size): Fel-Pro 1487
Head Bolts: ARP 154-3701 or Aeroflow AF37-2115 for 7/16" bolts or ARP 154-3603 or Aeroflow AF37-2117 for 1/2" bolts
Head Studs: ARP 154-4201 or Aeroflow AF37-2015 for 7/16" studs or ARP 154-4203 or Aeroflow AF37-2017 for 1/2" studs
Spark Plugs (14mm x 3/4" reach with flat gasket seat): Champion RC9YC

Installed Components

Intake Valves: Â 2.08" x 5.00" x 8mm, part no. AF59-3030
Exhaust Valves: Â 1.60" x 5.03" x 8mm, part no. AF59-3031
Valve Springs: Â 1.575" Dual spring
Valve Retainers: Â 10° 8mm
Valve Locks: Â 10° 8mm
Valve Seals: Â 8mm x .502" Viton
Rocker Arm Studs: Â 7/16"-14 x 7/16"-24, part no. AF59-3026
Push Rod Guide Plates: Â 5/16" Flat, part no. AF59-3027