Complete Small Block Ford Windsor 289 302 351 200cc CNC Ported Alloy Cy Heads

Aeroflow 200cc CNC Ported Aluminium Cylinder Heads for Small Block Ford Windsor (289-351) – Pair

Upgrade your Windsor-based street or strip engine with a complete pair of CNC ported aluminium cylinder heads. Built from A356-T6 aluminium and featuring precision port work, these heads are designed to deliver improved flow while keeping a practical price point for performance builds.

• Pair of 200cc intake runners with a 60cc combustion chamber and 68cc exhaust port volume
• Intake port dimensions: 2.13" x 1.28"; Exhaust port dimensions: 1.40" x 1.40"
• Material: A356 Aluminium; Spark plug location: OEM
• Valve sizes: Intake 2.08" diameter; Exhaust 1.60" diameter
• Valve stem diameter: 8mm; Rocker stud thread: 7/16" x 14; Valve angle: 20°
• Deck thickness: 0.750"
• Valve springs (installed height 2.050"): Installed pressure 175 lbs; Open pressure 415 lbs @ 500"; Maximum lift 0.800" @ 1.250"; Coil bind 1.200"
• Spring features: Outside diameter 1.570", Inside diameter 0.790", Free length 2.480"
• Valve spring retainers: Outside diameter 1.500", Inside diameter 0.465"; Retainer steps: 1.120" and 0.705"
• Valve spring locator: Outside diameter 1.615", Inside diameter 0.560"

Performance and design highlights

• Full CNC intake ports and chambered square exhaust ports, designed to maximize flow on street and race engines
• 5-angle competition valve job, diamond-honed bronze guides, hand bowl blending, and professional assembly support for improved reliability
• Designed to suit hydraulic roller camshafts and deliver strong mid-range to peak performance
• Maximum lift support up to 0.710" with the specified 200cc port configuration
• Drilled for 1/2" head bolts; if using 7/16" head bolts, a head bolt bushing kit or step-down bolts are required
• Important: verify installed spring seat pressure and open pressure before installation to ensure compatibility with your cam and valve train setup

Why these heads stand out

• Affordable Aeroflow performance: high-quality aluminium construction, deliberate CNC porting, and a focus on practical street/strip usability
• Balanced intake and exhaust flow with square ports helps improve throttle response and high-RPM breathing
• Lightweight, durable A356-T6 aluminium reduces reciprocating weight while maintaining strength under boost and high-RPM operation