Small Block Chev 327-350-400 212cc Aluminium Cylinder Heads Pair

Aeroflow 212cc Aluminium Small Block Chevy Cylinder Heads (Pair) for Street & Strip

Elevate your small block Chevy’s performance with Aeroflow’s complete aluminium cylinder heads. Crafted from ultra-smooth A356-T6 castings, these heads push flow numbers higher thanks to new as-cast runner and chamber designs, a precision 5-angle valve job, diamond-honed bronze guides, hand bowl blending, and professional assembly. Designed for street and drag applications, they deliver impressive flow at a competitive price for 327-350-400 small block builds.

Key specifications at a glance

• Material: A356 Aluminium
• Chamber: 66cc
• Intake Port Volume: 210cc | Intake Port Dimension: 2.21" x 1.30"
• Exhaust Port Volume: 72cc | Exhaust Port Dimension: 1.42" H x 1.53" W
• Exhaust Port Location: Raised.250"
• 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: Bronze | Valve Guide O.D.:.502" (0.560" at base)
• Rocker Stud Thread Size: 7/16" x 14
• Valve Angle: 23°
• Deck Thickness:.750"

Valve train & spring details

• Valve Spring Specifications: Installed Height 1.990" | Installed Pressure 190 lbs
• Open Pressure: 430 lbs @ 500" | Maximum Lift:.750" @ 1.240"
• Coil Bind: 1.190" | Spring Outside Diameter: 1.570" | Spring Inside Diameter: 0.790"
• Spring Free Length: 2.480"
• Valve Spring Retainer Outside Diameter: 1.500" | Inside Diameter: 0.465"
• Valve Spring Retainer Step 1: 1.120" | Step 2: 0.705"
• Valve Spring Locator Outside Diameter: 1.6100" | Inside Diameter: 0.565"

Design, performance & compatibility

The Aeroflow series of aluminium cylinder heads are built to unlock affordable performance for street and strip engines. These 212cc (intake) heads are designed for idle to 7500 rpm operation, and are suitable for 4.00" bore and larger engines. They arrive as a complete package and are designed to work with solid and hydraulic roller camshafts. The heads include larger-than-stock 1.57" diameter dual valve springs capable of handling up to 0.625" maximum lift, delivering robust lift without compromising reliability.

What’s included

• Complete cylinder heads (pair)
• Valves, valve springs, retainers & locks
• Guide plates
• 7/16" rocker studs

Performance edge & installation notes

These heads leverage advanced flow design and a refined chamber to support stronger mid-range torque and higher peak power in street and strip applications. Important installation note: check installed spring seat pressure and open pressure before installation to ensure the spring pressure matches your specific engine setup and cam profile.

Ideal applications

• Small Block Chevy engines in the 327, 350, and 400 range
• Street cruisers, street/strip builds, and budget performance projects
• Engines sized for bore 4.00" and larger