Aeroflow Complete SB Chev 327-350-400 186cc Alum Cylinder Heads with 67cc Chamb

Complete Small Block Chev 327-350-400 186cc Aluminium Cylinder Heads with 67cc Chamber (Pair)
2.00" x 1.20" Intake Port, 1.42" x 1.53" 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 Chevy cylinder heads are designed for entry level street performance engines to give the ultimate in flow at a budget price. Made from A356 aluminium castings, the 186cc cylinder heads are ideal for operating in the idle to 6500 rpm range. These cylinder heads will fit a 4.00" bore and larger.

Head Specifications

Material: A356 Aluminium
Chamber: 67cc
Intake Port Volume: 186cc
Intake Port Dimension: 2.00" x 1.20"
Exhaust Port Volume: 72cc
Exhaust Port Dimension: 1.42" H x 1.53" W
Spark Plug Location: Straight
Intake Valve Diameter: 2.02"
Exhaust Valve Diameter: 1.60"
Valve Stem Diameter: 11/32"
Valve Spring Pocket I.D.: 1.49"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .530" (.570" at base)
Rocker Stud Thread Size: 7/16" x 14
Valve Angle: 23°
Deck Thickness: .625"

Valve Spring Specifications

Installed Height: 1.790"
Installed Pressure: 130lbs
Open Pressure: 290lbs @ 500"
Maximum Lift: .530" @ 1.260"
Coil Bind: 1.200"
Spring Outside Diameter: 1.450"
Spring Inside Diameter: 0.700"
Spring Free Length: 1.350"
Valve Spring Retainer Outside Diameter: 1.400"
Valve Spring Inside Diameter: 0.395"
Valve Spring Retainer Step 1: 1.060"
Valve Spring Retainer Step 2: 0.680"
Valve Spring Locator Outside Diameter: 1.570"
Valve Spring Locator Inside Diameter: 0.565"

Suggested Components

Head Gasket: Fel-Pro 1003
Intake Gasket (1.20" x 2.00" Port Size): Fel-Pro 1204
Exhaust Gasket (1.34" x 1.39" D Port Size): Fel-Pro 1406
Head Bolts: ARP 134-3601 or Aeroflow AF37-2100
Head Studs: ARP 134-4001 or Aeroflow AF37-2000
Spark Plugs (14mm x 3/4" reach with flat gasket seat): Champion RC9YC

Installed Components

Intake Valves: Â 2.02" x 4.91" x 11/32", part no. AF59-3501
Exhaust Valves:Â 1.60" x 4.91" x 11/32", part no. AF59-3502
Valve Springs: Â 1.43" Single (with damper), part no. AF59-3503
Valve Retainers: Â 7° 11/32", part no.AF59-3504
Valve Locks: Â 7° 11/32" part no.AF59-3505
Valve Seals: Â 11/32" x .530"
Rocker Arm Studs: Â 7/16"-14 x 7/16"-24, part no. AF59-3506
Push Rod Guide Plates: Â 5/16" Flat, part no. AF59-3507