SB Chev Complete Aluminium Cylinder Heads 186cc with 67cc Chamber (Pair)

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 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. Include valves, valve springs,retainers & locks, guide plates and 7/16" rocker studs.

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. These complete heads include larger then stock 1.43" diameter valve springs to handle up to .575" maximum lift. Suits flat tappet and hydraulic camshafts.

Head Specifications

Material: A356 Aluminium
Chamber 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"
Important Information:

IMPORTANT NOTICE:

We recommend to check installed spring seat pressure & open pressure before installing your cylinder headsto make sure the spring pressure is correct for your application.